How many ways can you arrange seven different books on a shelf?

I know the answer is 5040 im just wondering how

Step-by-step explanation:

There are 7 books that can go in the first spot.

After a book has been placed in the first spot, there are 6 books left that can go in the second spot.

After that, there are 5 books that can go in the third spot.

So on and so forth.

So the number of ways is:

7*6*5*4*3*2*1 = 7! = 5040