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. The chance of getting Four of a Kind is 423:1. Only one of 86 combinations can be a Full House. 93:1 is a chance of getting a Flush. 85:1 is a chance of getting a Straight. The chance of getting Three of a Kind is 13:1. Only one of 8 combinations can be a Two Pairs. The chance of getting High Pair is 5:1. Computer Straight Poker Invention.