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यदि एक समान्तर श्रेणी के p वाँ पद 1/q तथा q वाँ पद 1/p है तो सिद्ध कीजिए कि प्रथम pq पदों का योग 1/2(pq + 1) है।

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माना, समान्तर श्रेणी का प्रथम पद a तथा सार्वअन्तर d हैं।

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