00:02
So we are having 20 kids and we're seeing how many pairs can we make.
00:07
Now, what we need to first recognize is this is this a permutation or a combination.
00:12
And this is going to be a combination.
00:14
And the keyword where for combination for me is that we are selecting, right? combinations are selections.
00:24
We are selecting these two people.
00:26
And think about it, right? if i have, let's just say i have two girls, anna and beth, right? and i'm saying anna is a and beth is b.
00:36
They are in a group whether or not anna is picked first and then beth or beth is picked first and anna is picked second.
00:45
It doesn't matter.
00:47
They're still in that group.
00:48
So this tells us that order doesn't matter.
00:51
Order doesn't matter.
00:53
They're still in that group regardless of who is picked.
00:57
First.
00:58
Order doesn't matter...