00:01
All right, so this time we have aaa, again is not working, a, a, a, a, b, b, c, c, c.
00:15
And so we want to know how many different ways we can put those letters.
00:18
But because there are repetitions, we're using the repetition formula.
00:22
There are nine of them, so that's nine factorial on the top.
00:26
And then we have three a's, so that's three factorial.
00:29
We have 3bs, so that's 3 factorial, and we have 3 c's.
00:36
Now, calculator can do that really quickly, or i'm going to write that out so you can see what that looks like.
00:43
If these numbers are small enough, i can do that.
00:48
So non -factorial means just that...