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      Question

      In each of the following questions, one number in the

      series does not follow the pattern of the others. Identify that wrong number in the series. 3, 6, 11, 18, 28, 38, 51
      A 28 Correct Answer Incorrect Answer
      B 38 Correct Answer Incorrect Answer
      C 51 Correct Answer Incorrect Answer
      D 6 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Look at the differences: 6 βˆ’ 3 = 3 11 βˆ’ 6 = 5 18 βˆ’ 11 = 7 28 βˆ’ 18 = 10 38 βˆ’ 28 = 10 51 βˆ’ 38 = 13 We expect a pattern of consecutive odd numbers: +3, +5, +7, +9, +11, +13 Correct series should be: 3 3 + 3 = 6 6 + 5 = 11 11 + 7 = 18 18 + 9 = 27 27 + 11 = 38 38 + 13 = 51 So the term should be 27, not 28. Hence 28 is the wrong number.

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