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" 6.किसी समानांतर श्रेढी के "p" वें,"q" ...

" 6.किसी समानांतर श्रेढी के "p" वें,"q" वे तथा "r" वें पद क्रमश: "a,b,c" हैं,तो सिद्ध करें "p(b-c)+q(c-a)+r(a-b)=0

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