[" 11.यदि किसी समांतर झ्रेणी के प्रथम "p...

[" 11.यदि किसी समांतर झ्रेणी के प्रथम "p,q,r" पदों का योगफल क्रमश : "a,b" तथा "c" हो तो सिड्ध "],[" कीजए कि "(a)/(p)(q-r)+(b)/(q)(r-p)+(c)/(r)(p-a)=0]

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