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Discussion :: Number Series

  1. Which number would replace the underline mark in the series 20, 40, 100, _, 820?
    2. A.
    240
    B.
    260
    C.
    280
    D.
    300

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    Answer : Option C

    Explanation :

    In this series, the difference between consecutive numbers is multiplied by 3; 20, 60, 180, 540.

    Therefore, the missing number would be 100 + 180 = 280 (option C)

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