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Discussion :: Probability

  1. A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly three bulbs are good.
    2. A.
    20/31
    B.
    20/63
    C.
    5/31
    D.
    6/31
    E.
    26/31

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    Answer : Option B

    Explanation :

    Required probability = (⁵C₃ . ⁴C₁)/⁹C₄ = (10 * 4)/126 = 20/63

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