If the sum of \( n \) terms of an AP is \( \left\{n P+\frac{1}{2} n(n-1) Q\right\} \), where \( ...

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If the sum of \( n \) terms of an AP is \( \left\{n P+\frac{1}{2} n(n-1) Q\right\} \), where \( P \) and \( Q \) are constants then find the common difference.
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