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March 26, 2017

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A bag contains 5 red, 9 white, and 10 blue marbles. Suppose you choose a marble from the bag and then choose another marble without replacing the first one. Find the probability of picking the same color both times.

  • Algebra 2 - ,

    = Prob(both red) + Prob(both white) + prob(both blue)
    = (5/24)(4/23) + (9/24)(8/23) + (10/24)(9/23)
    = 5/138 + 3/23 + 15/92
    = 91/276

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