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n-1-7-n-n-2-1-please-help-




Question Number 19117 by sandy_suhendra last updated on 05/Aug/17
Σ_(n=1) ^7  (n/((n^2 +1))) = ?  please help
$$\underset{\mathrm{n}=\mathrm{1}} {\overset{\mathrm{7}} {\sum}}\:\frac{\mathrm{n}}{\left(\mathrm{n}^{\mathrm{2}} +\mathrm{1}\right)}\:=\:? \\ $$$$\mathrm{please}\:\mathrm{help} \\ $$

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