Question

You need to arrange 9 of your favorite books along a small shelf. How many different ways can you arrange the​ books, assuming that the order of the books makes a difference to​ you?

Answer 1

362880

Explanation:

There are 9 ways to place the first book

There are 8 ways to place the second book given the first book

...

There is 1 way to place the ninth book given the eighth.

This can be represented by 9! (9 factorial), which is 9*8*7*6*5*4*3*2*1 = 362880.