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    Question

    A is trying to break a bulb by throwing balls at it. If

    he hits the bulb 4 times in every 11 throws and bulb breaks 5 times out of 21 hits, then find the probability of A breaking the bulb.
    A 19/231 Correct Answer Incorrect Answer
    B 18/231 Correct Answer Incorrect Answer
    C 10/231 Correct Answer Incorrect Answer
    D 20/231 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Probability of A hitting the bulb = 4/11  Probability of the bulb being broke on getting hit = 5/21 = 5/21 Probability of A breaking the bulb = (4/11) × (5/21) = 20/231

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