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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 β†’ (6 + 8 + 4) Γ— 2 = 36 2) 568: 38 β†’ (5 + 6 + 8) Γ— 2 = 38 3) 486: 39 β†’ (4 + 8 + 6) Γ— 2 = 36 4) 598: 44 β†’ (5 + 9 + 8) Γ— 2 = 44

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