College Math

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Suzy has a bag containing 5 red marbles, 2 green ones, 4 white ones, and 3 purple ones. She grabs 9 of them. Find the probability that she does not have all the green ones. Express the answer as a fraction in lowest terms.

  • College Math -

    Find the prob of getting both green ones
    which is
    C(2,2)*C(12,7)/C(14,9)
    = 792/2002

    so prob(not all green) = 1- 792/2002
    = 1210/2002
    55/91

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