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Deepak Bora
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Find the sum of − 5 + (− 8) + (− 11) + ………… + (− 230).

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The question is given from ncert Book of class 10th Chapter no. 5 Ex. 5.3 Q. 2 (iii). In the following question you have to find the sum of of the question given above & give the solution of the question briefly.

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  1. It is an A.P.,

    in which, a= -5, d= -8-(-5)=-3, l=-230

    First calculate the number in series…..

    l=a+(n-1)d

    -230=-5+(n-1)-3

    -225=-3n + 3

    3n=228

    n=76.

    Now,

    Sum of the series = n/2 (a+l)

    76/2 (-5-230)

    38 * -235 = -8930.

    So, the sum of your series would be -8930.

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