$[4/4$ Points$]$

SCAL

Practice Another

Use the Ratio Test to determine whether the series is conve

${\displaystyle \underset{n=1}{\overset{}{}}}\frac{(-9{)}^n}{n^2}$

Identify $a_n.$

$$

Evaluate the following limit$.$

$\underset{n}{lim}|\frac{a_{n1}}{a_n}|$

$$

Since $\underset{n}{lim}|\frac{a_{n1}}{a_n}|,1,.$

Use the Ratio Test to determine whether the series is conver

${\displaystyle \underset{n=1}{\overset{}{}}}\frac{(-2{)}^n}{n^2}$