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" Find the sum or inse of an A.P.is 49an...

" Find the sum or inse of an A.P.is 49and that of 17terms is 289,find the sum of n terms."

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

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If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.

If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.

If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.