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Math Help - help with a math probability question

  1. #1
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    help with a math probability question

    There are 12 marbles in a bag, and the marbles are either yellow or green. Two marbles will be randomly picked from the bag, without replacing the first one picked. The probability that both marbles will be yellow is 5/33 . How many GREEN marbles are in the bag?

    A) 4
    B) 5
    C) 6
    D) 7
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  2. #2
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    Quote Originally Posted by landonjones6 View Post
    There are 12 marbles in a bag, and the marbles are either yellow or green. Two marbles will be randomly picked from the bag, without replacing the first one picked. The probability that both marbles will be yellow is 5/33 . How many GREEN marbles are in the bag?
    Let y be the number of yellow marbles.
    Can you solve this: \dfrac{y}{12}\cdot\dfrac{y-1}{11}=\dfrac{5}{33}~?
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