A student claims that the sum of the first terms of an arithmetic progression with…

MATHEMATICS · Subjective · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

A student claims that the sum of the first nn terms of an arithmetic progression with first term aa and common difference dd is Sn=n(a+d).S_n = n(a + d). Explain why this claim is incorrect and obtain the correct formula for SnS_n in terms of aa, dd and nn.

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