In the derivation of the formula for

MATHEMATICS · Single correct · CBSE · Mathematics · We Distribute, Yet Things Multiply · We Distribute, Yet Things Multiply

Problem

In the derivation of the formula for Sn=1+2+3+⋯+nS_n=1+2+3+\cdots+n, the series is first written once in the original order and once in reverse order. What property of addition is being used when the two series are then added term-wise? (a) Associative property\text{Associative property} (b) Commutative property\text{Commutative property} (c) Distributive property\text{Distributive property} (d) Closure property\text{Closure property}

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