2.10.99 Number Series

YSLIVIA: Examine the rows for convergence: a) \ (\ sum_ {n = 1}^{\ infty} \ frac {4^{n}+5^{n}} {20 {n}} \), b) \ (\ 1}^{\ equy}} \ frac {n^{2}} {n^{7} +7} \), c) \ (\ sum_ {n = 1}^{\ infty} \ tan {\ pi} {3^{n}} \).