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      Question

      28         57           172

                689           ?               20677 What should come in place of question mark (?) in the following number series?
      A 3456 Correct Answer Incorrect Answer
      B 3804 Correct Answer Incorrect Answer
      C 3446 Correct Answer Incorrect Answer
      D 3302 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      28 × 2 + 1 = 57 57 × 3 + 1 = 172 172 × 4 + 1 = 689  689 × 5 + 1 = 3446 3446 × 6 + 1 = 20677

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