Hi I was wondering if anyone could explain this to me,

I have

Series (-1)^n n/ln(n)

sum : infinite

n:2

I took the derivative and got : 1/ln(x) - 1/(ln(x)^2)

How do I determine if this is a decreasing or increasing function.

From what I could tell 2 is the only value to make it go <0 , so is this neither increasing or decreasing?