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    Question

    What should come in place of question mark (?) in the following number series?

    28         57           172

              689           ?               20677
    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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