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Probability

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From a box containing 7 blue, 5 red, 3 green, and 9 yellow marbles, 2 are drawn one at a time without replacing the first marble before the second marble is drawn. Find the probability that one is blue and one is yellow.

  • Probability -

    Blue then yellow:
    P(BY)=7/24+9/23

    Yellow then blue:
    P(YB)=9/24+7/23

    P(YB∨BY)=P(YB)+P(BY)

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