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If the sum of $\mathrm{m}$ terms of an AP is $\mathrm{n}$ and the sum of $\mathrm{n}$ terms is $\mathrm{m}$, then the sum of $(\mathrm{m}+\mathrm{n})$ terms is
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The correct answer is:
$-(m+n)$
Given, $\mathrm{S}_{\mathrm{m}}=\mathrm{n}$ and $\mathrm{S}_{\mathrm{n}}=\mathrm{m}$
This is direct formula $\mathrm{S}_{\mathrm{m}+\mathrm{n}}=-(\mathrm{m}+\mathrm{n})$
This is direct formula $\mathrm{S}_{\mathrm{m}+\mathrm{n}}=-(\mathrm{m}+\mathrm{n})$
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