4 of a kind means 4 of our cards have the same denominations (like 4 spades). First, we have to think of what denominations we are going to choose and what suits they are going to be. Since we are choosing 5 cards in each exercise, this means we are going to have 2 denominations.

a full house consists of getting three(3) cards of one denomination and two(2) cards of another. The approach here is picking the denominations first, then picking the suits.

2 cards of one denomination, 2 cards of another denomination, 1 card of a different denomination. We have 3 denominations in total.

All cards have the same suit and it could be of any denomination and we need five of them So we are choosing 5 denominations out of 13 and they all have the same suit.