00:01
Alrighty, so for number 45, it's a little lengthy.
00:02
You're asked to write the permutations of the letters, a, b, c, and d, and all the different possibilities.
00:09
So we're going to kind of break it up into four sections.
00:14
We're going to start with the a's being first.
00:17
So you've got a, b, c, d, a, b, d, c.
00:28
And that's it for the a -b.
00:29
So then you switch now to a c, a, c, b, d, a, c, d, b.
00:37
And that's it for the c, a, c, a, c, so then you've got a, d, b, c, a, c, b.
00:46
So that's it for all a.
00:47
So there's six possibilities there.
00:49
Then we switch gears to the b's starting in the beginning.
00:52
So i can start with b, a, c, d, b, a, d.
00:57
C.
00:57
That's it for the b a's...