Convergent/Divergent? ∑n=1∞n−1n3+2n+7\displaystyle\sum_{n=1}^{\infty}{\frac{n-1}{n^3+2n+7}}n=1∑∞n3+2n+7n−1 (Hint Comp ∑1n2\sum{\frac{1}{n^2}}∑n21)