+0  
 
0
3
1
avatar+834 

I have $3$ different mathematics textbooks, $2$ different psychology textbooks, and $2$ different chemistry textbooks. In how many ways can I place the $7$ textbooks on a bookshelf, in a row?

 Oct 13, 2024
 #1
avatar+37146 
+1

7 P 7 =   7!  = 5040  ways 

     or

7 choices for first book 

6 choices for second book 

5 choices for third book 

.

.

.

1 choice  for last book                   7x6x5x4x3x2x1 - 7! = 5040 ways 

 Oct 14, 2024

3 Online Users

avatar