if the sum of 7 term is 49 and that of it's first 17 term is 289 find the sum of first n term of ap
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Sn=-107+12n square...............
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saurabhchamoli:
no the ans should be sn=n^2
i understand where i am going wrong
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Here's your answer I hope your doubt is clarified.
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some mistake Ans is n^2
ya! n/2[2+2n-2] = n[n} = n^2
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