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Math Help - probability-easy?

  1. #1
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    probability-easy?

    i have been working on this question for at least an hour and still couldnt get the answer.

    Question:
    Naomi a fan of alternative has 12CDs:
    3 Nine Inch Nails
    2 Sound Garden
    2Monster magnet
    1Pretty twisted
    2Queensryche

    If Naomi randomly loads her player with 5 CDs. What is the probability that will hold

    a) Exactly 1 Sound Garden
    b) 3 Nine Inch Nails or 3 Sound Garden

    I did:
    a) 2C1 TIMES 11C4
    12C5 12C5

    b)3c3 Plus 3C3
    12C5 12C5

    Thanks.
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  2. #2
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    Quote Originally Posted by questiongirl View Post
    i have been working on this question for at least an hour and still couldnt get the answer.

    Question:
    Naomi a fan of alternative has 12CDs:
    3 Nine Inch Nails
    2 Sound Garden
    2Monster magnet
    1Pretty twisted
    2Queensryche

    If Naomi randomly loads her player with 5 CDs. What is the probability that will hold

    a) Exactly 1 Sound Garden
    b) 3 Nine Inch Nails or 3 Sound Garden

    I did:
    a) 2C1 TIMES 11C4
    12C5 12C5

    b)3c3 Plus 3C3
    12C5 12C5

    Thanks.
    You say there are 12 CD's but you have only listed 10 ....?
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