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    Question

    A bag contains ‘x’ red balls and 2 green balls. If

    the probability of getting a red ball is 7/9, then find the probability of getting different coloured balls when two balls are drawn randomly from the bag.
    A 7/18 Correct Answer Incorrect Answer
    B 5/16 Correct Answer Incorrect Answer
    C 9/25 Correct Answer Incorrect Answer
    D 3/10 Correct Answer Incorrect Answer

    Solution

    x/(x + 2) = 7/9
    → 9x = 7x + 14 → x = 7
    Total balls = 9
    P = (7C1 × 2C1)/(9C2) = (7×2)/36 = 14/36 = 7/18

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