# In how many ways can 9 books be arranged on a shelf?

##### 1 Answer

Jan 14, 2016

#### Explanation:

*Assume that all the books are distinct from one another.*

There are:

9 ways to put the first book.

8 ways to put the second book after putting the first one.

7 ways to put the third book after putting the second one.

.

.

.

1 way to put the ninth book after putting the eighth one.

Multiply all the different number of ways together to get nine factorial.