If the first of an A.P. is a, second term is b and last term is c, then show that sum of all terms is [(a+c)(b+c-2a)]/2(b-a).
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If the first of an A.P. is a, second term is b and last term is c, then show that sum of all terms is [(a+c)(b+c-2a)]/2(b-a).
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