Poker probability The "nCr" function on most scientific calculators can be used to calculate hand frequencies; entering with and , for example, yields formula_2 as above. The royal flush is a case of the straight flush. It can be formed 4 ways (one for each suit), giving it a probability of 0.000154% and odds of 649,739 : 1. When ace-low straights and ace-low straight flushes are not counted, the probabilities of each are reduced: straights and straight flushes each become 9/10 as common as they otherwise would be. The 4 missed straight flushes become flushes and the 1,020 missed straights become no
Video poker of 100.2 percent, when played with perfect strategy — however, this % is only on a "10/7" version video poker game (10/7 being the payouts for a full house and a flush). There are many other video poker varieties of 10/6, 9/6, etc. that have slightly lower than the most generous 10/7 version payout. Although the full-pay version has a theoretically-positive return, few play well enough to capitalize on it. Double Bonus is a complex game.(4) It is also available with other pay schedules that have lesser theoretical returns: "Double Double Bonus" video poker is a variation of Jacks or