Parlay combination calculator. Caesars Sportsbook North Carolina Promo Code. Parlay combination calculator

 
 Caesars Sportsbook North Carolina Promo CodeParlay combination calculator Instead of parlaying the three bets in a three-team parlay

A four-team football parlay pays out at +1,100 ($11 for every $1 wagered) but has. For even money, put in 100 or -100. PARLAY CALCULATOR. Multiplied together, the overall odds of your parlay bet would work out to be 7. Effectively, you are having 11 all-up wagers. 00 wager is for each of the 3 combinations. NCAAB betting free pick and best bet analysis. That works out to an expected return of $161 for a $100 bet. PFN’s FREE Parlay Calculator and Betting Odds Calculator are also available for your betting process! New to sports betting?3 Team Parlay Payout: Payout gets higher than a two-team wager. Hit the Calculate button. When typing in odds with a minus (-) sign you must include the sign (e. To convert fractional odds to positive American odds, you just take the value of the fraction (say 3/2 = 1. 5 and under 36. If the Chiefs do cover -10. The first thing to realize is that all lottery combinations are a lot of numbers. a 6 team parlay is 2^6 which is 64 combinations a 2 team round robin with 6 teams is (n X n-1) _____ = total combinations of 2 teamers 2 where n = total number of teams ex. So, if it’s $2 on 10 parlay combinations, the total risk would be $20. This gives you the opportunity to calculate the odds on any amount of parlays,. In the example in the last paragraph, if you only wanted to bet. Parlay calculator. 4 Team Parlay. Round robin bets must include at least three different parlays, although technically there is no limit. The free parlay calculator allows you to create a parlay bet that combines multiple games and provides the projected payout. A spread bet in football is normally offered at -110 on both sides of the bet. College Football Parlay Pick #3 - Notre Dame (-25. However, be careful!The combination makes it more valuable compared to a standard parlay. Free Excel Template to create all combinations of 6 lists of values. Parlays can be a combination on spreads, totals, money lines, or even props. Therefore the calculation for your wager on Team A is as follows: Team A: 100 / 120 = 0. 967. The parlay math behind this is a bit tricky to do in your head and involves translating all odds to the decimal format and then multiplying the decimal odds. 625 x £1 = £35. The more games you pick, the more parlay combinations that are possible. For an example, we’ll use a three-bet parlay involving three team who have odds of +200, +100 and -300. There are your multipliers. Again for the curious, the equation for combinations with replacement is provided below: n C r =. It makes sense that there are fewer choices for a combination than a permutation, since the redundancies are being removed. To parlay a bet is simply to reinvest the winning dividends from one race to a bet on a subsequent race. 8333. Parlay combination equations are used to determine odds payouts when betting. Whether you’re a beginner or seasoned bettor,. For negative odds, divide -100 by the fractional odds value ( (-100/ (1/3. Build your perfect parlay with the USA TODAY Parlay Calculator powered by Tipico Sportsbook. Chris Boline | August 22, 2023. To use this calculator, enter a bet amount and the odds on every leg of the parlay, up to 12 legs. Step 2: Deposit. Round robin bets must consist of at least three teams (or bets). Finally, the parlay payout is your own stake multiplied by the parlay odds. Our calculator supports all major formats: American Odds (-400) Decimal Odds (1. You can create all possible combinations of two-team parlays as a round robin bet. What Is Parlay Calculator? The Parlay Calculator indicates how much money sports bettors would win if they placed a bet on a certain number of games. Typical Parlay Odds. Number Of Races/Legs. Make your selections. What is a parlay in sports betting? A parlay is a bet on two or more point spreads, over/unders or moneylines to increase the possible payout Get help calculating Parlay Odds using The Action Network's Parlay Calculator to make informed sports betting decisions. The Round Robin Bet Calculator allows you to calculate the stake, return and profit for Round Robins, permed from up to 20 selections if required, with the same. Try our free parlay calculator now!What is a parlay bet: how to calculate parlay odds. 00 (one horse in each of the two races) $2 Daily Double Part Wheel: 1,2,4 with 1,5,7. You can also use our Parlay Calculator to calculate your potential winnings and odds on any NBA parlay bet. After compiling your betting. 2. Note: The calculator accepts US or decimal odds. if you hit at least 5 of the games you make. Select your betting market and note down the odds for each selection. 5 (-110) Parlay 2. Then in the wager amount enter 100. A parlay calculator is a tool which can be used to work out returns from a parlay bet. All of those. The odds for each game are counted as an individual bet. Calchub Style – customize the calculator for each individual calculator. Use the AceOdds Bet Calculator to work out returns for Accumulators, Lucky 15's, Doubles, Trebles, Football, Horse Racing and more. Follow these steps to use our free parlay calculator, as listed previously in the example atop the page. For the most part, however, parlays can include a combination of the moneyline bets, over/under bets, spread bets, and prop bets, with props being the least likely to appear in most parlays. If you win two of the parlays but lose one then it would be $26 x 2=$52 minus $10 from the losing parlay (minus the vig). A ‘Push’ reduces the number of selections in the parlay. 50, and the odds of +200 would be converted to 3. MGM ‘One Game Parlay’ This MGM parlay option is perfect for any bettors watching their team live, or watching any game for that matter. To calculate moneyline odds from fractional odds greater than 1/1, multiply +100 by the fraction. Our parlay odds calculator can show you your expected payout from a parlay bet based on the amount wagered and the odds of each leg in any format (American, Fractional, or Decimal). Most spreads for NFL games will sit at a price of (-110) to (-125). This sports betting calculator helps bettors compare moneyline odds and point spread odds. The percentage boost offered on your parlay wins ranges from 5% to 70%, depending on the number of teams on your bet slip, with two being the minimum. 5 and under 36. If you are a Parlay Sports Bettor, this calculator will save you a bunch of time when strategizing on which parlay bets to play!! Please visit my website, ht. To use this calculator, enter a bet amount and the odds on every leg of the parlay, up to 12 legs. 10. 4 Team Parlay Payout: When you get a four-team parlay, the odds are really high. 3. Bet must be placed using real money in combination with the Odds Boost Token, Offer applies to Sport bets only. 3. Parlay Calculator. Check here before you place bets on horses if you want to. If you entered everything correctly the payout should read $33. See what your total payout and winnings will be. 91 x 1. For example, if you selected three games, you could indicate that you want to bet on a 3-team parlay, as well as any 2-team parlays from those three games. Luckily, the calculations aren’t all that complicated. Parlay – is a combination of two or more single bets, where all bets must win in order to win this. Option 2 is round robin. This makes it simpler to understand the parlay formula. Picking three teams and making two-team parlays is a pretty common way to go here. In the moneyline odds, some bookmakers provide the odd in fraction; others in decimal. Cardinals +3, and Tampa Bay Buccaneers -7, you can add those three picks to your bet slip and bet on each two-team parlay combination. Select a bet type in the right column. 0 = 8. 100) and parlay odds for each leg (e. 91 x 1. Payoffs are determined by a simple formula that changes the money line into a decimal number and combines it with the other lines in the parlay. For example, imagine you’ve chosen five selections at odds of -350, -200, -225, -450, and -500. Use the Trixie return calculator to work out your winnings online for all sports. Download App. They can provide insight on what are often dazzling returns. For example, a correlated same game parlay in NBA would be a combination of the Detroit Pistons at +12. 5 times, 1. Free Parlay Calculator for Sports Betting. Our Teaser Calculator allows you to select up to 14 teams in a teaser bet. In the boxes under 'Odds' enter the moneyline odds of each game in your parlay. A seven-bet parlay would involve the multiplication of seven individual results, rolling each of the previous wagers into the next. 1; Selection B @ 1. Use our free bet calculator to calculate the cost and winning return of any bet type. Including Odds Calculators and Super Bowl Bet Calculator specially designed by SBR betting experts. Bigger is not always better, though. The parlay calculator will show you two things: how much profit you can make by placing a parlay bet and the probability of winning the bet you’ve put in. bet365 takes the parlay bet concept to another level by adding an up to 70% boost on your winnings if the parlay succeeds. For example; ORL Magic @ -185 and HOU Rockets @ -105. In this case, BetMGM has created a 2-leg parlay of Hawks +7. An eight-play parlay with the same odds per play gives a return of $1,280 including the stake. TIP: Once you’ve entered a wager amount, you can click on the word Trixie to see a breakdown of the combinations of your bet. Over 7 million possibilities according to the COMBIN function in Excel. Now that we have the multipliers, we multiply them together to come up with the True odds of the parlay. Enter the “Notional Bet”, which is the amount in dollars that you wish to wager on the reverse bet at a particular sports betting site. Experiment with different combinations. Option 1 is a traditional parlay. Add bet365 soccer accumulator bonus. Build your perfect parlay with the USA TODAY Parlay Calculator powered by Tipico Sportsbook. Updated April 8, 2019. They combine the advantages of accumulator bets through higher odds, but do not lead to a total loss in case of a wrong bet. 8333 = 8. CALCULATING PARLAY PAYOUTS. When considering making a parlay, it’s important to understand the odds and the potential payout prior to placing your bet. Parlay Combinations to Determine Odds. The calculation to work out the parlay odds starts by multiplying the odds together – 2. For example, if you wish to parlay four horses, and you wish to combine them in all combinations (which is the essence of a parlay bet) you need to have 11 win bets: six doubles, four trebles and one four horse accumulator. If you place a parlay bet with three selections, multiply the odds of these three selections to get the parlay odds. This is because the chances of getting the three plays right are tougher than only two results. The “Total Risk”, which is the total size. You now need to select a cell where you want to have the result of possible combinations to appear. 1- Enter your parlay wager amount. A parlay builder can be accessed at Bet365 Canada and the US version of Bet365, which works with the following sports: NFL, Basketball, Tennis and Soccer. The odds calculator shows the amount of money. 29 percent. 10 entries would give 9 864 100 which exceeds the number of available rows. With our round robin payout calculator, you can work out your profit and explore how outcomes and wager sizes influence your winnings. When doing this, all of your betting selections must win for your bet to win. It owes part. Then subtract the original. Parlay betting is a high-risk, high-reward wager and the more bets involved the slimmer the odds of hitting the parlay. Although it is nearly impossible to beat the house, it is certainly possible to maximize your odds of success by utilizing proper strategy. Your potential parlay payout is easiest to calculate using decimal odds. Check out Odds Shark’s Parlay Calculator to find the parlay odds for any combination of games, bets or events. 4. For every bet, the calculation involves multiplying the stake with the odd. For a complete explanation of how NFL parlay picks work, read our Parlay Bets And Odds, Explained page. If we wager $100 on this parlay and all three bets win, it will pay out $759. 33. 8333 = 8. Enter the odds for each bet within the parlay, line by line. Minnesota Vikings -3 (-110) Cleveland Browns +4 (-110) Parlay 2. To calculate “+” American odds, take the odds number and divide by 100, then multiply that by the size of the bet. A teaser bet is a lot like a parlay bet, all of the games you picked must win in order for you to win. ) If you need to add more legs, just hit the + button. All the individual selections must either win or tie to win a parlay bet. After running the code, all combinations will be listed in the next column of the data list. If you lose even one of the selections, you lose your wager. If you want to remove any of the wagers from your parlay, simply click the garbage can icon. FanDuel nabbed an early market-share lead in US sports betting and has outflanked its rivals. You can use a betting odds calculator to convert fractional odds to American or decimal odds, or you can take the long way by hand. On the other hand, you can still parlay several heavy favorites at -200 or more. To include every possible combination of events, construct a few smaller parlays. A parlay bet is a multiple bet where several selections are tied together in one bet, called a parlay. 6. For example, if you were to put down $20 on a 3-team moneyline parlay with all teams being -110 favorites, our parlay calculator will immediately tell you that the payout will be $119. 77, you can see why parlay betting is so appealing. ” – Paul Ricci (Chief Sports Editor) No Sweat First Bet Up To $1,000. But all the selections must win for the bet to win. In order to just see potential profit, you need to subtract out your original bet. With a hedge bet calculator, you can calculate the ideal combination of bets to maximize your potential returns while minimizing your losses. For example, a common bet slip will include five teams. ) into a single stake. A multi bet combines a series of single bets into one wager. 33 – 1. Follow these simple steps to figure out how much to bet. 5 Cowboys -12. 8. Minnesota Vikings -3 (-110) Indianapolis Colts +6. North Carolina Betting Promos. 00 = 2. 1. As you can see from the image above, if we were to place a $10 bet on the By 2’s x 6 wager and all teams won, then we would be set to win $195. " All legs of a parlay must win for the bet to become a winner. A $100 wager on +200 would result in a $200 payout, +100 pays out $100, while -300 results in a $33. 76 and expect to pay out $100 (including the stake. Total Return. 4, just multiply all three numbers with your stake. . The NFL playoffs attract a huge betting handle (or total amount of money wagered) each year. Let's Avoid Confusion Figuring out parlay odds without using parlay odds calculators can sometimes be confusing because of the odds format used. We’ll go over how progressive parlays. The parlay odds and payout are automatically calculated on your bet slip. we have developed a parlay calculator that can compute the bet cost and potential returns of. You have to be sure to check the total amount you are wagering before hitting submit. 44. You can enter your own stake and the odds for a single bet or a range of multiple bets. At +340 odds, this $100 bet would win $340 plus the original stake for a total return of $440. Again for the curious, the equation for combinations with replacement is provided below: n C r =. Using the example above, let’s say you bet $50 on the first 2-1 shot. 2, 1. You can choose to place an each-way multi bet by selecting each-way from the settings menu. The money line-to-decimal formula is straightforward: Favorites - A negative value (-250) money line divide 100 by the number. Just add in the moneyline odds into the bet line, you can add up to 15 selections in total. The steps to using a betting odds calculator are: 1. When you use the round robin option, you instantly create all three possible two-team parlays: Seattle Seahawks -4 Denver Broncos +2. A parlay bet is a single wager that requires two or more outcomes to all win. In a k- permutation the notion of order is important A,B is different from B,A, contrary to combinations. you will need any three of your four bets to win. A multibet (or multi for short), also known as a ' Parlay ' or ' Accumulator ', is a bet type that combines a series of single bets (also known as legs within a multi) into one bet. Parlay Betting Basics. 64/1 odds on a. 29, 1. These are each individual bets so the $10. Points. g. A third leg, Arizona State +14. Take this NFL examples with seven teams — if I want to do all combinations, even putting $1 on each parlay will cost over $200. The calculator supports moneyline odds that are popular in the US and decimal odds for customers in Canada. 5 rush YPG and three rushing touchdowns over the last two games. The betslip is also easy to edit with the parlay option being readily available for most bet combinations. Call 1-800-GAMBLER. If you pick a favorite, you must enter the moneyline with a minus (-) (-110 for example). Our Teaser Calculator allows you to select up to 14 teams in a teaser bet. 70 on the Dolphins to win on FanDuel, no matter who wins, you will. Post author: Post published: May 21, 2023 Post category: jeffersonville high school staff directory Post comments: 10 facts about the witches in macbeth 10 facts about the witches in macbethAn easy process to calculate your parlay odds, potential winnings and payout for any parlay bet, using any form of odds. Place Same Game Parlays & Same Game Parlay+ on NFL® games that have already started! 1. The bet slip shows you the odds of your parlay along with the potential payout, depending on your stake. Enter the amount of your wager in the box next to "Amount ($)" and click on "Calculate". Navigate to the ‘Football’ category on Caesars and click on the game. The total profit and loss can be worked out by inputting the odds taken, the number of selections and their outcomes into the parlays odds calculator. By inputting different wager amounts, you can determine how much you stand to win or lose based on your bet size. 2495. The Jets didn’t score a touchdown last week in Monday night’s 27-6 home loss to the Los Angeles Chargers, and Wilson be hard-pressed to not to crap out in Vegas. Additionally, the round robin calculator will determine your total risk! Unlike in a parlay bet, if you stake $100 on a 3 leg round robin, you’ll actually be risking $300 total, with $100 bet on each 2 leg parlay. Once you hit calculate the payout should display 1149. ca or the mobile app. Note that the amount you enter will pertain to the stake of each individual parlay combination. What is a parlay in sports betting? A parlay is a bet on two or more point spreads, over/unders or. 66 x 2. BetNow – Mobile betting site is often referred to as the easiest to use. a six team round robin would be (6 X 5) _____ = 15 2 so in a 6 team round robin with 2 teamers all combinations of the two teamers are 15A two-way round robin means that you are betting as many different two-team parlay combinations as you can with a given number of teams. Unlike a moneyline parlay, a point spread parlay specifically focuses on a team’s margin of victory or defeat. Here is an example for the Super Bowl:Example: A Euromillions player wishing to guarantee a win (2 correct numbers) should therefore play all the combinations of 2 numbers, so 2 among 50 = 1225 grids. For example, suppose there are 20 employees, and we want to. You now take that number and multiply that amount by your stake (35. Louis Cardinals must win. Generate one or more random sets of numbers with the lottery number generator. Step 1: Enter your odds. 8 billion in betting volume for the 2020 Super Bowl alone, an astronomical number for a single game. 5 (-110) Parlay 2. You can do a 7 team round robin with every possible combination of 2 team, 3 team, 4 team. A parlay bet is a single wager that requires two or more outcomes to all win. A parlay is a bet that combines multiple selections into a single wager that has a payout only when all parts win. 5 (1st Half)/Lions +7 (Game) Now obviously one of these wagers is going to lose, but that’s okay! Our goal here is just to win however many parlays we need to in order to turn a profit. Calculate: The calculator will provide you with the total risk, total return, and situational result based on the entered results. The more games, the higher the risk but the greater the payout. Adding a couple of spreads into a parlay can easily increase your odds to almost (+300). See how much you'd win based on the odds of your total wagers, and amount bet. This calculator eliminates the need for manual calculations and provides accurate results in seconds. Parlay Formula is a unique way to bet on the races. 625. You can combine spreads, money lines, totals and different sports in Round Robin parlay bets. Select the lottery game you want to play or generate custom lottery number picks. Improve your game and make the. So, if it’s $2 on 10 parlay combinations, the total risk would be $20. The heavy favorites in the parlay decrease the size of the payout. Each way bets are a max of £5 each way (£10 total). 5 and Clippers +1. One thing I think that is convenient from Hedgeline is that they allow. 79 depending on the sportsbook and the factor involved. Watch & Win! You can track the outcome of your parlay live in the “Active Bets” tab. +1765. 20 if all three wagers are successful. 97. Once you make your selections, an RR will create parlays of all possible combinations between them. 8333. In Team #1 I enter -110, Team #2 -110, Team #3 -120 and Team #4 -115. com calculator allows you to calculate returns on 29 different bet types, or can be used as an odds calculator to work out potential winnings. Simply enter the odds for both sides of a wager to determine the. (r + n -1)! r! × (n - 1)! This free calculator can compute the number of possible permutations and. Parlay odds: +387. Enter your wager and press “calculate”, or the appropriate action button. Parlay combination equations are used to determine odds payouts when betting. Once all that information is in the calculator, just hit the calculate. Bet # 1. The sum of the potential win amount ($81. To use the OddsJam parlay calculator, simply input the odds for each leg of your parlay. Compare how different outcomes on each selection might affect your profits before placing your bet. Parlay calculators are used to calculate the potential payout of a parlay bet, which is a type of bet where multiple wagers are combined into a single bet. The payout is re-calculated based on the reduced number of teams. Should a single wager lose, the payout is zero. Round robin bets must include at least three different parlays, although technically there is no limit. 6666 x 2. The odds of the individual selections are multiplied together, and then multiplied by the set total bet to calculate the expected payout. 62). Round Robin Example. The combinations are endless, and our experts find there best picks from various sports to combine our best picks and parlays today. The point spread calculator will determine the implied moneyline odds for the game using historical data. Hi all, I need to create a spreadsheet which will generate all possible combinations of 8 games of soccer consisting of two teams who can each win or come a draw (3 outcomes per game). 21+. An 11-team round robin, for example, has 2,036. 180/100 = 1. TAB Sportsbet provides one to its customers to help them with their betting investments. Enter the odds being offered on your bet slip at your sportsbook. Single Single bet is a bet placed on just one selection or market. However, given how high his yardage line is, there is no reason why. How to Use Our Betting Odds Calculator. Parlay Betting Basics. $100 Parlay to win $250 on the Patriots -3. 5. It does become a more straight forward moneyline parlay calculator if betting on the spread or totals however as they are fixed odds. $440. 2. Show more. To win at Powerball, pick 5 out of 69 (69 choose 5), then pick 1 out of 26 (26 choose 1). Why Use a Parlay Bet Calculator? Because a parlay bet is a combination of two or more wagers that rely on each other to win, using a parlay calculator is easy and can save you time while. 67 x 2. It works by taking the odds for each individual bet in the parlay and calculating the potential payout if all of the bets are successful. 5 x 1. For example, if $8 is to be divided into 4 bets, such as: 1. Round Robin Parlays. Parlay odds are created by taking a blended combination of the individual odds that make up the parlay bet. 2. Free Permutations and Combinations Calculator - Calculates the following: Number of permutation(s) of n items arranged in r ways = n P r Number of combination(s) of n items arranged in r unique ways = n C r including subsets of sets This calculator has 2 inputs. The combination of multiple bets into one decreases the odds on the entire parlay bet winning. Here’s a list of some of the most popular parlay combinations that Philippines punters pick online: Money Line Parlay Betting – this bet involves selecting the result of more than one tie in a single bet. All the teams you pegged as favourites must win their respective games in order for the betting card to payout. If you’re betting on a three-team parlay with the following odds: 1. They allow the bettor to input the odds for each part of the parlay wager to provide a rapid. The big changes are in lower numbers. 5 (1st Half)/Patriots -7 (Game) $100 Parlay to win $250 on the Lions +3. CALCULATING PARLAY PAYOUTS A teaser is a combination of two or more football/basketball spreads/totals where you get a better line on each pick in exchange for a lower payout. The Fun part about parlay wagering is seeing how much your picks combination will payout! Granted, when you’re wagering mostly on favorites, you can’t expect to pay off the mortgage or that monthly car payment, because the odds won’t be as inviting. A simple, but important first step is to use a. 91 if the bet hits, and in the example above, we. 07. Parlay combination calculator - Our parlay calculator will combine up to 12 games and calculate your payout based on your bet amount and the odds for each game. A five-play parlay of +100 for each selection returns $160 including a $10 stake. Pick each player to have MORE or LESS than their projected fantasy score or single stat. The more bets (also called “legs”) you put together, the bigger the potential payout. A parlay calculator can assist in managing your bankroll effectively. Some sports books allow bettors to include different kinds of prop bets, half. Exacta, Trifecta, Superfecta, Daily Double, Pick 3, Pick 4, Pick 6, and more! Select how much you want to bet. 6. For even money, put in 100 or -100. If I did my math right, you will be looking at 986 409 permutations. A parlay odds calculator is a common tool used by many sports bettors looking to make Vegas parlay bets. Parlay payout: Bet $10 to profit $153. com. The odds of the pick-3 game are: - straight pick: 1 in 1000; - boxed: 1 in 220; - front/back pair: 1 in 100. Use the AceOdds Bet Calculator to work out returns for Accumulators, Lucky 15's, Doubles, Trebles, Football, Horse Racing and more. Updated: Mar 22, 2023. 2 Team Parlay: 13-5 odds. 2. The default settings are 11 for combination size, and 22 for the number of items on the list, but you can adapt the parameters for your own purposes. Hedgeline is an online parlay combinations calculator pretty much what i'm looking for, but it is extremely out dated, has some issues with the inputs for the odds and they only offer up to 6 game combinations (not to mention it is subscription based after a free trial =/). By creating various combinations of parlays, you increase your chances of hitting at least one winning parlay. 09. Unfortunately, the UFC 294 rounds totals are bang-on,. Our Teaser Calculator allows you to select up to 12 teams in a teaser bet. Your total By 2's x3 wagers would cost $30. Calculating the cost of trifectas where different selections are made for each place is more difficult which is why it is best to use our calculator. Updated: August 4, 2023 Parlay Odds Calculator- Work Out Parlay Bets. With the click of a button, it becomes a trifecta calculator, then a Heinz, Goliath. A three-team parlay consisting of three -200 favorites would have parlay odds of +237. You can convert your odds between American, decimal and fractional quickly. 00, 3,00, 4. A round robin (RR) bet allows you to combine multiple parlays into one bet. 5 1st Quarter Points in Bengals. Choose how much you’d like to risk on your parlay bet. 89 (payout = $163. Parlay Odds. If you bet on each different outcome, there will be one winner at $260 and three $100 losers ($300). I like four-team round robins featuring moneyline underdogs each priced somewhere between +180 and +400. 6 to 1. The parlay can be broken up into individual parlays that include every team in your original parlay. Enter the odds for Game 1, Game 2 and so on. Calculate the number of possible combinations given a set of objects (types) and the number you need to draw from the set, otherwise known as problems of the type n choose k (hence n choose k calculator), as well as n choose r (hence nCr calculator).