00:02
Okay, so there are keywords that we have to understand with permutations and combinations.
00:08
So for permutations and combinations, permutations and combinations.
00:18
All right, so with combinations, the keywords here are choosing to choose or to select, right? whereas permutations are to arrange, right? or to, it's really a range, right? there's also, i'm forgetting, there's one more for permutations, but i'm arranging it.
00:43
So let's look at a, arrange, a range, a range of plants in a row b.
00:48
Well, that means that a is going to be a permutation.
00:50
So that one is out because of that keyword arranging.
00:54
Now look at answer b, selecting 10 questions out of 15.
00:58
So that means it's select.
00:59
That means that that is a combination...