1. The first and last terms of an arithmetic progression are 25 and -52. What is the sum of the series if it has 12 terms?
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By: anil on 05 May 2019 02.15 am
In an arithmetic progression with first term, $$a = 25$$ , last term, $$l = -52$$ Number of terms = $$n = 12$$ $$ herefore$$ Sum of A.P. = $$frac{n}{2} (a + l)$$ = $$frac{12}{2} (25 - 52)$$ = $$6 imes (-27) = -162$$ => Ans - (A)
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