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      Question

      Which of the following numbers will replace the

      question mark (?) in the given series? 7, 13, 27, 53, 107, 213, ?
      A 425 Correct Answer Incorrect Answer
      B 427 Correct Answer Incorrect Answer
      C 429 Correct Answer Incorrect Answer
      D 431 Correct Answer Incorrect Answer

      Solution

      7 x 2 - 1 = 13 13 x 2 + 1 = 27 27 x 2 - 1 = 53 53 x 2 + 1 = 107 107 x 2 - 1 = 213 213 x 2 + 1 = 427

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