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यदि S1, S2, S3,.......,Sr उन समान्तर श्र...

यदि `S_1, S_2, S_3,.......,S_r` उन समान्तर श्रेढियों के n पदों के योग हो, जिनके प्रथम पद क्रमशः 1, 2, 3,....... है और सार्व अंतर क्रमशः 1, 3, 5, ........... है, तो सिद्ध कीजिए की
`S_1 + S_2 + ..........+ S_r =(nr)/2(nr+1)`

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