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If the sum of p terms of an A.P. is q and the sum of q terms is p, show that the sum of p + q terms is – (p + q).

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If the sum of p terms of an A.P. is q and the sum of q terms is p, show that the sum of p + q terms is – (p + q). Also, find the sum of first p – q terms (p > q).

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Let first term and common difference of the A.P. be a and d, respectively. Given, Sp = q

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