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Discussion :: Probability

  1. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow?
    2. A.
    3/22
    B.
    4/21
    C.
    2/21
    D.
    1/14
    E.
    None of these

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    Answer : Option C

    Explanation :

    Given that there are three blue marbles, four red marbles, six green marbles and two yellow marbles. Probability that both marbles are blue = ³Câ‚‚/¹âµCâ‚‚ = (3 * 2)/(15 * 14) = 1/35 

    Probability that both are yellow = ²Câ‚‚/¹âµCâ‚‚ = (2 * 1)/(15 * 14) = 1/105 

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