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Discussion :: Number Series

  1. One term in the number series is wrong. Find out the wrong term.
    6, 15, 35, 77, 165, 221

    2. A.

     35
    B.

     77
    C.

     165
    D.

     15

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    Answer : Option C

    Explanation :

    The terms of the series are products of two consecutive prime numbers i.e. (2 x 3),
    (3 x 5), (5 x 7), (7 x 11),.....
    So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.

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