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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. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g., 25 - Operations on 25 such as adding/ subtracting/ multiplying etc. to 25 can be performed. Breaking down 25 into 2 and 5 and then performing mathematical operations on 2 and 5 is not allowed)
    A 11 - 100 Correct Answer Incorrect Answer
    B 14 - 169 Correct Answer Incorrect Answer
    C 10 - 81 Correct Answer Incorrect Answer
    D 16 - 325 Correct Answer Incorrect Answer

    Solution

    In all the given pairs, 2nd number = (1st number - 1)² In option 'A', 11 - 100': = (11 - 1)² = (10)² = 100 In option 'B', '14 - 169': = (14 – 1)² = (13) ² = 169 In option 'C', '10 - 81': = (10 - 1)² = (9)² = 81   In option 'D', '16 - 325': = (16 - 1)² = (15)² = 225

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