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Discussion :: Number Series

  1. Find out the wrong term: 6, 15, 35, 77, 165, 221

    2. A.

     35
    B.

     77
    C.

     165
    D.

     221

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    Answer : Option C

    Explanation :

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

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