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      Question

      Select the number that will replace the question mark

      (?) in the following series. 31, 34, 39, 46, 57, 70, ?
      A 87 Correct Answer Incorrect Answer
      B 89 Correct Answer Incorrect Answer
      C 85 Correct Answer Incorrect Answer
      D 81 Correct Answer Incorrect Answer

      Solution

      31 + 3 = 34 34 + 5 = 39 39 + 7 = 46 46 + 11 = 57 57 + 13 = 70 70 + 17 = 87

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