# Math Help - 2 in 1

1. ## 2 in 1

Hey guys, can you help me with this on please?
First one, I need to proof convergence, and the second one is to find the radius of converge.

2. The first series in the part A does not necessarily converge.
If $a_n = 2 + n$ then $\sum\limits_{n = 1}^\infty {\frac{1}{{a_n }}} = \sum\limits_{n = 1}^\infty {\frac{1}{{2 + n}}}$ diverges.