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Discussion :: Number Series

  1. Which term of the series 5, 8, 11, 14, ....is 320 ?

  2. A.

     104th

    B.

     105th

    C.

     106th

    D.

     64th

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    Answer : Option C

    Explanation :

    Clearly, 5 + 3 = 8, 8 + 3 = 11, 11 + 3 = 14,................
    So, the series in an A.P. in which a = 5 and d = 3
    Let 320 be the nth term of the series.
    Then, 320 = 5 + (n - 1) × 3 or (n - 1) = 105 or n = 106


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