Question

How do you find the number of ways to listen to 4 CDs from a selection of 8 CD?

Answer 1

`""^8C_4=(8!)/((8-4)!4!)=70`

Explanation:

This is equivalent to choosing 4 from an available 8 and is hence the combination

`""^8C_4=(8!)/((8-4)!4!)=70`