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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 Γ— 12C2 = 4356 probability = 495/4356 = 55/484

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