Different winning combination have different chances of coming out. Only one of 40,000 combinations can be a Royal Flush. 10,000:1 is a chance of getting a Straight Flush. Only one of 423 combinations can be a Four of a Kind. The chance of getting Full House is 86:1. The chance of getting Flush is 93:1. Only one of 85 combinations can be a Straight. The chance of getting Three of a Kind is 13:1. The chance of getting Two Pairs is 8:1. 5:1 is a chance of getting a High Pair. Casino Poker Full House.