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      Question

      The second number in the given number-pairs is obtained

      by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs except one. Find that odd number-pair.
      A 11: 38 Correct Answer Incorrect Answer
      B 18: 59 Correct Answer Incorrect Answer
      C 22: 71 Correct Answer Incorrect Answer
      D 13: 42 Correct Answer Incorrect Answer

      Solution

      The pattern followed here is as follows:

      (First number × 3) + 5 = Second number

      11: 38 → (11 × 3) + 5 = 33 + 5 = 38

      18: 59 → (18 × 3) + 5 = 54 + 5 = 59

      22: 71 → (22 × 3) + 5 = 66 + 5 = 71

      13: 42 → (13 × 3) + 5 = 39 + 5 = 44 (should be 44, not 42)

      So, 13: 42 is the odd number-pair.

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