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      Question

      9 19 39 ? 159

      319 What will come at the place of questions mark (?) in the below given series:
      A 109 Correct Answer Incorrect Answer
      B 79 Correct Answer Incorrect Answer
      C 99 Correct Answer Incorrect Answer
      D 139 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      9 × 2 + 1 = 19 19 × 2 + 1 = 39 39 × 2 + 1 = 79 79 × 2 + 1 = 159 159 × 2 + 1 = 319

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