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Deepak Bora
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Find the sums of 34 + 32 + 30 + ……….. + 10.

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The question is given from ncert Book of class 10th Chapter no. 5 Ex. 5.3 Q. 2 (ii). In the following question you have to find teh sum of the given A.P. Also answer the question briefly.

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  1. Given:-
    a = 34 , d = – 2 , l = 10
    We know that,
    Sn = n/2 ( a + l)

    We have to find out n =?..
    An = a + ( n – 1) d
    10 = 34 + ( n- 1) (- 2)
    10 = 34 – 2n + 2
    10 = 36 – 2n
    – 26 = – 2n
    n = 13.
    S13 = 13/2 ( 34 + 10)
    S13 = 13/2 x 44
    S13 = 13 x 22
    S13 = 286.

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