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      Question

      Select the number from among the given options that can

      replace the question mark (?) in the following series. 4, 21, 85, 256, 513, ?
      A 522 Correct Answer Incorrect Answer
      B 514 Correct Answer Incorrect Answer
      C 536 Correct Answer Incorrect Answer
      D 516 Correct Answer Incorrect Answer

      Solution

      4 × 5 + 1 = 21 21 × 4 + 1 = 85 85 × 3 + 1 = 256 256 × 2 + 1 = 513 513 × 1 + 1 = 514

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