Math, asked by srividya24, 1 year ago

If the sum of first 7terms of an A.P is 49 and that of 17 terms is 289 ,find Sn

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Answered by Animesh282
2
7/2+ 2a+(7-1)d =49,
17/2 + 2a+(17-1)d=289, solve both u will get the answer sis
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Answered by JAYACHAUDHARY1
1
see further simplify eq 1 nd 2
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