00:01
In this question, we are going to be calculating probability.
00:05
We are selecting four cards from a deck, and the problem describes that there is not replacement.
00:11
We're trying to get a four of a kind.
00:13
So there are 52 cards in the deck.
00:16
We're going to select five each time we select one.
00:20
There's one fewer card in the deck.
00:23
So those are my denominators.
00:29
Then the first card selected, it doesn't matter.
00:36
The second card doesn't matter.
00:40
Then it starts to matter.
00:44
My third card has to match one of these two.
00:49
So there are three left of each of those two...