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    Question

    Four number pair have been given, out of which three

    are alike in a certain way and one is different. Select the one that is different. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g., 13 - operation on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)
    A 16 - 252 Correct Answer Incorrect Answer
    B 20 - 396 Correct Answer Incorrect Answer
    C 15 - 221 Correct Answer Incorrect Answer
    D 11 – 119 Correct Answer Incorrect Answer

    Solution

    The logic followed is as follows: In each pair, the second number = (First number)Β² - 4. Option 'A': 16 – 252 β†’ 16Β² - 4 = 256 - 4 = 252 Option 'B': 20 – 396 β†’ 20Β² - 4 = 400 - 4 = 396 Option 'C': 15 – 221 β†’ 15Β² - 4 = 225 - 4 = 221 Option 'D': 11 – 117 β†’ 11Β² - 4 = 121 - 4 = 117

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