Which of these series converges by the Kummer's Test with cn=nc_n = ncn=n?
∑1n2\sum \frac{1}{n^2}∑n21
∑1n\sum \frac{1}{n}∑n1
∑1n\sum \frac{1}{\sqrt{n}}∑n1
∑1lnn\sum \frac{1}{\ln n}∑lnn1