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    Question

    A bag contains 9 blue, 12 yellow and 15 black balls. Two

    balls are randomly drawn from the bag, what is the probability that a blue and a yellow ball are drawn?
    A 2/15 Correct Answer Incorrect Answer
    B 6/35 Correct Answer Incorrect Answer
    C 5/21 Correct Answer Incorrect Answer
    D 7/36 Correct Answer Incorrect Answer
    E 4/29 Correct Answer Incorrect Answer

    Solution

    The probability that a blue and a yellow ball are drawn = (9C1 × 12C1) / 36C2
    = (9 × 12) / 630 = 108 / 630 = 6/35

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