Question

student who wants to buy 3 CDs, but assume that there are 3 CDs featuring the piano, 6 CDs featuring the trumpet, and 5 CDs featuring the saxophone.
(2) In how many ways can the selection be made if CD's featuring at least 2 different instruments are selected?

Answer 1

Selections with 3 or 2 CDs of piano, trumpet or saxophone must be excluded. Therefore the required number of ways is given by:
14C3 - (3C3 + 3C2 + 6C3 + 6C2 + 5C3 + 5C2) = you can calculate

Answer 2

@kropot72 that is not correct

Answer 3

Do you have answer choices?

Answer 4

no blanks

Answer 5

What are your reasons for disputing the method of solution that I posted?