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    shivangib89's Avatar
    shivangib89 Posts: 1, Reputation: 1
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    #1

    Aug 23, 2010, 06:01 AM
    probability
    There are 20 balls of green color,20 balls of red color,20 balls of blue color,20 of balck,20 of yellow. How many u have to pick to guarantee 2pairs of same color?
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    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Aug 23, 2010, 06:12 AM

    It happens where you are sure what colour you're going to pick. How many balls of can you pick if you don't get any pair?

    When you found this number, on the next pick, no matter what colour it is, you already have one ball of some colour already picked, so, you'll get your pair then. Can you post what you think is the answer? :)
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