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math

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an urn contains 3 blue chips and 7 red chips. sequentially draw 3 chips without replacement. what is the probability that all drawn chips will not be the same color?

  • math -

    prob ( that they are the same colour)
    = BBB or RRR
    = (3/10)(2/9)(1/8) + (7/10)(6/9)(5/8)
    = 6/720 + 210/720
    = 216/720
    = 3/10

    prob(not the same colour) = 1 - 3/10 = 7/10

  • math -

    Many thanks!!!

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