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Discussion :: Number Series

  1. Find the missing term: 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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