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Math Help - Find number of combinations

  1. #1
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    Find number of combinations

    Scarlett purchased five new mp3s. She has room to add only three more onto her mp3 player. How many possible combinations of songs can be added to her mp3 player?


    A. 10
    B. 20
    C. 30
    D. 60
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by totally-confused View Post
    Scarlett purchased five new mp3s. She has room to add only three more onto her mp3 player. How many possible combinations of songs can be added to her mp3 player?


    A. 10
    B. 20
    C. 30
    D. 60
    This will be P(5,3), that is the number of ways to choose 3 songs from 5, in some order

    P(5,3) = 5!/(5-3)! = 60

    see Probability for more info

    EDIT: I think order counts here, so I changed C(5,3) to P(5,3)
    Last edited by Jhevon; April 4th 2007 at 03:54 PM.
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