00:01
Three married couples have bought six seats in the same row for a movie.
00:05
How many ways can they be seated without any restrictions? well, that means we have six ways to pick the first seat, five to the second, four, the third, three, the fourth, to the last, and then one for the last.
00:21
And then we'll just end up multiplying those together.
00:24
We'll get those answers in a minute.
00:25
So that's for your first problem.
00:27
For the next problem, we want to know how many ways they can be sitting.
00:30
If each couple is to sit together.
00:34
So that means we have husband one with wife one, husband two with wife two, husband three with wife three.
00:44
So how many ways can we pick husband one? three.
00:48
Once we pick husband one, there's only one way to pick wife one.
00:52
How many ways to pick husband two? we now have two.
00:56
Only one way to pick his wife...