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
Poker hand poker"). So while the "majority" of poker game variations are played "high hand", where the best high "straight, flush etc." wins, there are poker variations where the "worst hand" wins, such as "low ball, acey-ducey, high-lo split etc. game variations". To summarize, there can be variations that are "high poker", "low poker", and "high low split". In the case of "high low split" the pot is divided among the best high hand and low hand. Poker has many variations, all following a similar pattern of play and generally using the same hand ranking hierarchy. There are four main families