Question

During the year you must read 3 books for English class. You can choose from a list of 6 books. How many different sets of 3 books can you choose?

Answer 1

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:   $\dfrac{6!}{(6-3)!}=\dfrac{6\times 5\times 4\times 3!}{3!}=6\times 5\times4=120$