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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 all the four bulbs are defective.
    2. A.
    62/63
    B.
    125/126
    C.
    1/63
    D.
    1/42
    E.
    1/126

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    Answer : Option E

    Explanation :

    Out of nine, five are good and four are defective. Required probability = ⁴C₄/⁹C₄ = 1/126

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