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Discussion :: Number Series

  1. 5, 6, 9, 15, ?, 40

    2. A.

     21
    B.

     25
    C.

     27
    D.

     33

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    Answer : Option B

    Explanation :

    The pattern is + 1, + 3, + 6,....., i.e. + 1, + (1, + 2), + (1 + 2 + 3),.....
    So, missing term = 15 + (1 + 2 + 3 + 4) = 25.

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