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OpenStudy (pulsified333):
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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OpenStudy (kropot72):
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
OpenStudy (pulsified333):
@kropot72 that is not correct
OpenStudy (kropot72):
Do you have answer choices?
OpenStudy (pulsified333):
no blanks
OpenStudy (kropot72):
What are your reasons for disputing the method of solution that I posted?
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