So there's four suits, each of them have nine cards, so that gives us 36 unique cards. A hand is a collection of nine cards, which can be sorted however the player chooses. So they're essentially telling us that order does not matter. What is the probability of getting all four of the ones? So they want to know the probability of getting all four of the ones. So all four ones in my hand of nine. Now this is kind of daunting at first.