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    Question

    Four number-pairs are given, out of which three are

    alike in certain manner and one is different. Choose the different number-pair.
    A 684: 36 Correct Answer Incorrect Answer
    B 568: 38 Correct Answer Incorrect Answer
    C 486: 39 Correct Answer Incorrect Answer
    D 598: 44 Correct Answer Incorrect Answer

    Solution

    All the digits of the first number are added together and then multiplied by 2 to obtain the second number. 1) 684: 36 → (6 + 8 + 4) × 2 = 36 2) 568: 38 → (5 + 6 + 8) × 2 = 38 3) 486: 39 → (4 + 8 + 6) × 2 = 36 4) 598: 44 → (5 + 9 + 8) × 2 = 44

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