Question

At the electronics emporium, 10 CDs are on sale. Marie can only afford to buy 3 CDs. How many combinations of CDs are possible?

Answer 1

120 combinations of CDs are possible

Explanation:

The total combinations could be

`10C_3`

`(10*9*8*7!)/(7!*3!)`

On further expanding, we get -

`(10*9*8)/(3!) \\(10*9*8)/(3*2*1) \\= 10*3*4\\= 120`

Hence, 120 combinations of CDs are possible