0 votes 0 votes The infinite series $\Sigma_{n=1}^{\infty} \frac{a^n \log n}{n^2}$ converges if and only if $a \in [-1, 1)$ $a \in (-1, 1]$ $a \in [-1, 1]$ $a \in (-\infty, \infty)$ Others isi2016-mmamma sequence-series convergence-divergence summation non-gate + – go_editor asked Sep 13, 2018 recategorized Nov 19, 2019 by Lakshman Bhaiya go_editor 239 views answer comment Share Follow See 1 comment See all 1 1 comment reply `JEET commented Nov 19, 2019 reply Follow Share $3$ options are same in the que? Is it?? 0 votes 0 votes Please log in or register to add a comment.