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March 29, 2017

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dent who wants to buy 3 CDs, but assume that there are 4 CDs featuring the piano, 6 CDs featuring the trumpet, and 7 CDs featuring the saxophone.

(1) In how many different ways can the 3 CD's be selected?


(2) In how many ways can the selection be made if CD's featuring at least 2 different instruments are selected?

  • finite MAth - ,

    1-

    4+6+7=17
    17-3=14

    17!/14!
    =680

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