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    stats Posts: 1, Reputation: 1
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    #1

    Oct 21, 2007, 02:42 PM
    Probability of gum balls
    Please help me solve this problem. I need to show my work and I'm not even sure where to start. Thanks in advance.

    A gum ball dispenser has 38 orange gum balls. 30 purple ones and 18 yellow ones. Using three quarters what is the probability that of the 3 gum balls obtained, exactly 1 will be purple and one will be yellow?
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    galactus Posts: 2,271, Reputation: 282
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    #2

    Oct 21, 2007, 04:11 PM
    There are 86 gumballs in all. The probability of getting a purple is 30/86. The prob. Of a yellow is then 18/85. The other one has to be orange, so 38/84

    But these can come out in 3!=6 ways.
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