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    Question

    20, 247, 447, 620, ?,

    885 What will come in the place of questions (?) mark in following questions.
    A 746 Correct Answer Incorrect Answer
    B 798 Correct Answer Incorrect Answer
    C 766 Correct Answer Incorrect Answer
    D 844 Correct Answer Incorrect Answer
    E none Correct Answer Incorrect Answer

    Solution

    Here series follows the pattern- 20+227 = 247 247+(227-27) = 447 447+(227-27×2) = 620 620+(227-27×3) = 766 766+(227-27×4) = 885

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