Question

Tammy has 4 cds that she is going to give away. She lets her best friend choose 2 of the 4 cds. How many different groups of 2 cds are possible

Answer 1

6 different groups.

Explanation:

This is the number of combinations of 2 fro m 4:

4C2 = 4! / 2! 2!

= 4 * 3 *2 *1 / (2*1*2*1

= 24/4

= 6 groups.