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    Question

    Study the given pattern carefully and select the number

    from among the given options that can replace the question mark (?) in it. 11               15           9 14               16           ? 75              31           88
    A 25 Correct Answer Incorrect Answer
    B 18 Correct Answer Incorrect Answer
    C 13 Correct Answer Incorrect Answer
    D 22 Correct Answer Incorrect Answer

    Solution

    First column = (14 + 11) x (14 – 11) = 25 x 3 = 75 Second column = (16 + 15) x (16 – 15) = 31 x 1 = 31 First column = (y + 9) x (y – 9) = 88 → y ² – 9 ² = 88 → y ² – 81 = 88 → y ² = 88 + 81 → y ² = 169 → y = 13

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