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

    Question

    17 rotten bananas are accidentally mixed with 120 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 122/137 Correct Answer Incorrect Answer
    B 110/137 Correct Answer Incorrect Answer
    C 120/137 Correct Answer Incorrect Answer
    D 120/107 Correct Answer Incorrect Answer

    Solution

    Numbers of bananas = Numbers of rotten bananas + Numbers of good bananas ∴ Total number of bananas = 120 + 17 = 137 bananas P(E) = (Number of favourable outcomes) / (Total number of outcomes) P(picking a good banana) = 120/137

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