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March 25, 2017

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How do I approach this problem?

Seven green marbles and three red marbles are randomly placed in Box A and in Box B. Box A holds 4 marbles, while Box B holds 6. What is the probability that Box A has at least 2 green marbles?

  • math - ,

    There aren't that many cases
    We can just list them , box A first, then Box B

    GGGG GGGRRR
    GGGR GGGGRR
    GGRR GGGGGR
    GRRR GGGGGG

    Since the order does not matter, that is all
    of these have 2 or more R's in boxA
    so prob = 2/4 = 1/2

  • oops - math - ,

    It asked for at least 2 G's in A, should read more carefully.

    so prob of 2 or more G's in box A is 3/4

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