Answer: 120
Step-by-step explanation:
First book and Second Book and Third Book
6 choices x 5 remaining choices x 4 remaining choices = 120
If you want to use a formula: [tex]\dfrac{6!}{(6-3)!}=\dfrac{6\times 5\times 4\times 3!}{3!}=6\times 5\times4=120[/tex]
