math

A box contains 5 yellow balls, 3 blue, and 1 red ball. Two balls are drawn at random. Find the probability that:

The two balls have the same color

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  1. you could pick either two yellow or 2 blue
    prob(your event) = (5/9)(4/8) + (3/9)(2/8)
    = 5/18 + 1/12
    = 13/36

    or ( C(5,2) + C(3,2) )/C(9,2)
    = same as above

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