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If the sum of p terms of an AP is q and ...

If the sum of p terms of an AP is q and the sum of q terms is p, then show that the sum of `p+q` terms is `-(p+ q)`. Alos, find the sum of first `p-q` terms (where, `p gt q`)

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The correct Answer is:
`((p-q)(p+ 2q))/(p)`
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