Now, we're going to learn how to count and arrange. (As if just learning to count wasn't exciting enough!)
How many ways can we arrange three books on a bookshelf?
Here are the books:
Well, there's one arrangement.
Let's pound out the others:
That's all of them... There are 6 ways to arrange three books on a bookshelf.
What about five books?
Dang! I don't want to have to draw it all out!
Let's FIGURE it out instead.