New RBI Grade B 2025 Notification will come Soon! Enroll Here

    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 3 times out of 7 hits, then find the probability of A breaking the bulb.
    A 11/67 Correct Answer Incorrect Answer
    B 12/77 Correct Answer Incorrect Answer
    C 10/77 Correct Answer Incorrect Answer
    D 12/75 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 = 3/7 Probability of A breaking the bulb = (4/11) × (3/7) = 12/77

    Practice Next

    Relevant for Exams: