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

    Question

    10 rotten bananas are accidentally mixed with 140 good

    ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana is taken out at random from this lot. Determine the probability that the banana is taken out is a good one.
    A 13/15 Correct Answer Incorrect Answer
    B 11/15 Correct Answer Incorrect Answer
    C 14/15 Correct Answer Incorrect Answer
    D 17/21 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Numbers of bananas = Numbers of rotten bananas + Numbers of good bananas ∴ Total number of bananas = 140 + 10 = 150 bananas P(E) = (Number of favourable outcomes) / (Total number of outcomes) P(picking a good banana) = 140/150 = 14/15

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