1. The first and last terms of an arithmetic progression are -32 and 43. If the sum of the series is 88, then it has how many terms?
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By: anil on 05 May 2019 02.10 am
First term of AP, $$a=-32$$ and last term, $$l=43$$ Let there be $$n$$ terms Sum of AP = $$frac{n}{2}(a+l) = 88$$ => $$frac{n}{2}(-32+43)=88$$ => $$frac{11n}{2}=88$$ => $$n=88 imes frac{2}{11}$$ => $$n=8 imes 2=16$$ => Ans - (A)
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