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Math Help - counting #2

  1. #1
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    counting #2

    a)A pianist plays 7 different pieces at a recital. In how many ways can he arrange these pieces in the program?
    b) in how many ways can first, second, and third prizes be awarded in a contest with 140 contestants?
    explain me the answer pls.
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  2. #2
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    Quote Originally Posted by zpwnchen View Post
    explain me the answer pls.
    a) 7!

    b) (140)(139)(138) = ...
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