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[" (9.) If the sum of first "7" terms of...

[" (9.) 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."]

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

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