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?

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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?

Mathematics
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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
@kropot72 that is not correct
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What are your reasons for disputing the method of solution that I posted?

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