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Discussion :: Number Series

  1. Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?

    2. A.
    14
    B.
    15
    C.
    21
    D.
    23

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    Answer : Option B

    Explanation :

    In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.

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