What is the probability that none of the suits of the 3 cards on the flop matches either of your 2 hole cards? For instance, if you have 2 3, and the flop is 3 Q Q, then we would say at least one of the flop cards has a suit matching your hole cards (the 3 matches the 2). But if you have 2 3, and the flop is 3 Q Q, then none of the suits on the flop matches your hole cards.