Math, asked by sanju415121225, 1 year ago

Please answer this question my buddies
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Answered by matsfeliks
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sum of first 7 terms i.e. S7 is 49 and similarly S17 is 289. By putting these values in the formula of Sn u will get two equations . Solve them simultaneously and u will get the answer.the value of n will be 7 and 17 respectively
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