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    Question

    Four number-pairs have been given, out of which three

    are alike in some manner and one is different. Select the number-pair that is different.
    A (11, 249) Correct Answer Incorrect Answer
    B (13, 165) Correct Answer Incorrect Answer
    C (18, 315) Correct Answer Incorrect Answer
    D (15, 225) Correct Answer Incorrect Answer

    Solution

    (11, 119) → 11² - (1 + 1) = 121 – 2 = 119.  (13, 165) → 13² - (1 + 3) = 169 – 4 = 165. (18, 315) → 18² - (1 + 8) = 324 – 9 = 315. (15, 219) → 15² - (1 + 5) = 225 – 6 = 219.

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