Update ANS: If the sum of first m terms of an AP be n and the sum of its first n terms be m then show that the sum of its first (m+n) terms is −(m+n).

5 Nov 2020

If the sum of first m terms of an AP be n and the sum of its first n terms be m then show that the sum of its first (m+n) terms is −(m+n).

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