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[" यदि किसी समांतर श्रेणी के प्रथम "p" ,...

[" यदि किसी समांतर श्रेणी के प्रथम "p" ,"q,r" पदों का योगफल क्रमशः "a,b" तथा "c" हो तो सिद्ध "],[" कीजिए कि "(a)/(p)(q-r)+(b)/(q)(r-p)+(c)/(r)(p-a)=0]

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