Download if the sum of first 7 terms of an ap is 49 and that of 17 terms is 289 find the sum offirst 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 offirst n terms if the sum of first 7 terms of an ap is 49 and that of 17 terms is 289 find the sum offirst n terms if the sum of first 7 terms of an ap is 49 and that of 17 terms is 289 find the sum offirst n terms

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