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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

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    Answer : Option B

    Explanation :

    NA

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