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If the sum of the first m terms of an AP is n and the sum of first n terms is m. Then, show that the sum of its first (m+n) terms is -(m+n) |
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Answer» If the sum of the first m terms of an AP is n and the sum of first n terms is m. Then, show that the sum of its first (m+n) terms is -(m+n) |
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