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      Question

      Select the number from the given option that can replace

      the question mark (?) in the following series. 7, 15, 32, 67, 138, 281, ?
      A 568 Correct Answer Incorrect Answer
      B 563 Correct Answer Incorrect Answer
      C 585 Correct Answer Incorrect Answer
      D 598 Correct Answer Incorrect Answer

      Solution

      7 Γ— 2 + 1 = 15 15 Γ— 2 + 2 = 32 32 Γ— 2 + 3 = 67 67 Γ— 2 + 4 = 138 138 Γ— 2 + 5 = 281 281 Γ— 2 + 6 = 568

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