00:02
For this problem, we're going to look at each situation and figure out whether it's a permutation or a combination.
00:09
And the key to figuring it out is to remember that with permutations, order matters, and with combinations, order doesn't matter.
00:17
So, phone number, the order of the numbers matters, so that's a permutation.
00:22
Social security number, same idea, the order of the numbers matters, so it's a permutation.
00:27
A hand of cards in a poker game.
00:30
The order doesn't matter.
00:31
You can rearrange the cards in your hand and it's still the same hand.
00:35
So that's a combination...