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

At the electronics emporium, 10 CDs are on sale.

Valduarte07

17.06.2021

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

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mxdv

22.04.2021

3x+5=20
=>3x=15
=>x=5

i am not sure what you are talking but its solving than here it is.

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