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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. 
      A (32 – 61) Correct Answer Incorrect Answer
      B (47 – 91) Correct Answer Incorrect Answer
      C (39 – 75) Correct Answer Incorrect Answer
      D (78 – 159) Correct Answer Incorrect Answer

      Solution

      The logic followed here is: Second number = 2 X First number - 3 (32 – 61) → 32 X 2 = 64 – 3 = 61. (47 – 91) → 47 X 2 = 94 – 3 = 91. (39 – 75) → 39 X 2 = 78 – 3 = 75. (78 – 159) → 78 X 2 = 156 – 3 = 153.

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