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 with pay schedules that offer a theoretical return as high as 100.8 percent, when played with perfect strategy. This full-pay version is found only in Nevada. It is also available with other pay schedules that have lesser theoretical returns: Variations are available that pay different amounts for the quad "deuces", such as Double Deuces (2000), Loose Deuces (2500), Triple Deuces (3000), and Royal Deuces (4000). Full pay Loose Deuces (25-17-10), once common but now rare, is one of the highest return versions of video poker offered. Sigma Flush Attack is a combination of video poker and a banking slot, in