New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A bag contains x white balls, (x + 4) black balls and (x

    + 8) yellow balls. If probability of getting a black ball is 1/12 more than that of getting a white ball, then find the probability of getting a yellow ball.
    A 5/12 Correct Answer Incorrect Answer
    B 7/12 Correct Answer Incorrect Answer
    C 11/12 Correct Answer Incorrect Answer
    D 1/12 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    (x + 4 – x)/(3x + 12) = 1/12

    Or, 3x + 12 = 48

    Or, x = 12

    So, desired ratio = 20/48 = 5/12

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