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

Answer:

120 combinations of CDs are possible

Step-by-step explanation:

The total combinations could be

$10C_3$

$\frac{10*9*8*7!}{7!*3!}$

On further expanding, we get -

$\frac{10*9*8}{3!} \\\frac{10*9*8}{3*2*1} \\= 10*3*4\\= 120$

Hence, 120 combinations of CDs are possible