21. $\sum_{n=1}^{\infty} \left( \frac{n^2+1}{2n^2+1} \right)...

$\sum_{n=1}^{\infty} \left( \frac{n^2+1}{2n^2+1} \right)^n$

Determine se a série é absolutamente convergente, condicionalmente convergente ou divergente.

$21. $\sum_{n=1}^{\infty} \left( \frac{n^2+1}{2n^2+1} \right)^n$$

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