यदि किसी समांतर श्रेणी के प्रथम p,q,r पद...

यदि किसी समांतर श्रेणी के प्रथम `p,q,r` पदों के योगफल क्रमश : a, b तथा c हों तो सिद्ध कीजिए कि `(a)/(q)(q-r)+(b)/(q)(r-p)+(c)/(r)(p-a)=0`

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