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    Question

    Three of the following number-pairs are alike in some

    manner and hence form a group. Which number-pair does not belong to that group? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations 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 21 – 420 Correct Answer Incorrect Answer
    B 22 – 462 Correct Answer Incorrect Answer
    C 18 – 306 Correct Answer Incorrect Answer
    D 15 – 240 Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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