Which comparison is most useful to prove ∑n=1∞1n2+n\sum_{n=1}^{\infty} \frac{1}{n^2+n}∑n=1∞n2+n1 converges?
Compare to ∑1n\sum \frac{1}{n}∑n1
Compare to ∑1n2\sum \frac{1}{n^2}∑n21
Compare to ∑1\sum 1∑1
Compare to ∑1n\sum \frac{1}{\sqrt{n}}∑n1