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Discussion :: Number Series

  1. 8 11 21 15 18 21 22

    2. A.
    25 18
    B.
    25 21
    C.
    25 29
    D.
    24 21
    E.
    22 26

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    Answer : Option B

    Explanation :

    This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.

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