1. The first and last terms of an arithmetic progression are -23 and 42. What is the sum of the series if it has 14 terms?
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By: anil on 05 May 2019 02.15 am
In an arithmetic progression with first term, $$a = -23$$ , last term, $$l = 42$$ Number of terms = $$n = 14$$ $$ herefore$$ Sum of A.P. = $$frac{n}{2} (a + l)$$ = $$frac{14}{2} (-23 + 42)$$ = $$7 imes 19 = 133$$ => Ans - (B)
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