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
Four flush frequently by screenwriter John Hughes as something of a trademark. In National Lampoon's Christmas Vacation, Clark refers to his boss as "four flushing" in his tirade over his corporate Christmas present; in "" it is used by the mafia boss Johnny in the fictional film "Angels with Even Filthier Souls"; and in "Uncle Buck", a quite drunk Pooter the Clown calls Buck a four flusher when ordered to leave the family home, which results in Buck punching the clown right in the face. Four flush A four flush (also flush draw) is a poker hand that is one card short