In one or two sentences

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

Problem

In one or two sentences, state the condition under which pairing the first and last terms of a sequence gives equal sums, and briefly explain why this allows quick calculation of the total.

Related theory

Arithmetic Progressions
Sequences and series
Algebra
Sum of first n terms of an AP

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