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  • Question
  • Find the sum of the Arithmetic Series upto 36 terms 2, 5, 8, 11,...


  • Options
  • A. 3924
  • B. 1962
  • C. 1684
  • D. 1452

  • Correct Answer
  • 1962 

    Explanation

    Arithmetic Series ::

     

    An Arithmetic Series is a series of numbers in which each term increases by a constant amount.

     

    How to find the sum of the Arithmetic Sequence or Series for the given Series ::

     

    When the series contains a large amount of numbers, its impractical to add manually. You can quickly find the sum of any arithmetic sequence by multiplying the average of the first and last term by the number of terms in the sequence.

     

    That is given by  S n   =   n ( a 1   +   a n ) 2  Where n = number of terms, a1 = first term, an = last term

     

    Here Last term is given by  a n   =   a 1   +   n - 1 d  where d = common difference

     

    Now given Arithmetic Series is 

     

    2, 5, 8, 11,...

     

    Here a1 = 2,  d = 3, n = 36 

     

    Now,  a n =   a 1   +   n   -   1 d   a 36 =   2   +   36   -   1 3   =   105   +   2   =   107  

     

    Now, Sum to 36 terms is given by

     

    S 36   =   36 ( 2   +   107 ) 2   =   36   x   109 2   =   3924 2   =   1962

     

     

     

    Therefore, Sum to 36 terms of the series 2, 5, 8, 11,... is 1962.

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