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Discussion :: Probability

  1. Out of 10 persons working on a project, 4 are graduates. If 3 are selected, what is the probability that there is at least one graduate among them?
    2. A.
    1/6
    B.
    5/8
    C.
    3/8
    D.
    5/6
    E.
    7/8

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    Answer : Option D

    Explanation :

    P(at least one graduate) = 1 - P(no graduates) = 

    1 - ⁶C₃/¹â°C₃ = 1 - (6 * 5 * 4)/(10 * 9 * 8) = 5/6

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