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      Question

      Find the wrong number in the given number series.

      7, 15, 31, 57, 87, 127
      A 31 Correct Answer Incorrect Answer
      B 57 Correct Answer Incorrect Answer
      C 127 Correct Answer Incorrect Answer
      D 87 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Check differences: 15 тИТ 7 = 8 31 тИТ 15 = 16 57 тИТ 31 = 26 87 тИТ 57 = 30 127 тИТ 87 = 40 The intended pattern seems: +8, +16, +24, +32, +40 (each increase by 8). Correct series should be: 7 7 + 8 = 15 15 + 16 = 31 31 + 24 = 55 (not 57) 55 + 32 = 87 87 + 40 = 127 So 57 is incorrect.

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