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Discussion :: Probability

  1. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are picked at random, what is the probability that they are all blue?
    2. A.
    1/455
    B.
    2/455
    C.
    1/91
    D.
    4/455
    E.
    None of these

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    Answer : Option A

    Explanation :

    Given that there are three blue marbles, four red marbles, six green marbles and two yellow marbles.

    Probability that all the three marbles picked at random are blue = ³C₃/¹âµC₃ = (1 * 3 * 2 * 1)/(15 * 14 * 13) = 1/455

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