Q3. If the sum of the first m terms of an AP is n and first n terms is m then show that sum of its first (m+n) terms is - (m+n)

$Sum of First n Terms of an AP (Part 2) | Arithmetic Progressions| CBSE | Class 10 | Math show$

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Q3. If the sum of the first m terms of an AP is n and first n terms is m then show that sum of its first (m+n) terms is - (m+n)

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