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    Question

    12 Marbles and 12 balls are kept in a box. If 4 items

    are chosen at random, Find the probability that 2 is a marble and another 2 is ball
    A 13/36 Correct Answer Incorrect Answer
    B 55/484 Correct Answer Incorrect Answer
    C 55/584 Correct Answer Incorrect Answer
    D 47/384 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total probability = 12C4 = 495 Probability that 2 is marble and another 2 is ball = 12C2 ├Ч 12C2 = 4356 probability = 495/4356 = 55/484

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