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    Question

    A box contains 4 yellow balls, 5 black balls and 3 white

    balls. If two balls are drawn randomly, find the probability that none of them is black or white
    A 1/11 Correct Answer Incorrect Answer
    B 1/6 Correct Answer Incorrect Answer
    C 1/12 Correct Answer Incorrect Answer
    D 1/15 Correct Answer Incorrect Answer

    Solution

    Required probability = (4 × 3) ÷ (12 × 11) = 12 ÷ 132 = 1/11

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