Question

Determine whether the series is absolutely convergent, conditionally convergent, or divergent.

Answer 1

\[\sum_{n=0}^{\infty}\frac{ (-1)^n }{ 9n+1 }\]

Answer 2

Well, if we just had \(\color{black}{\displaystyle \frac{1}{9n+1} }\) (without the (-1)^n part) would it converge?

Answer 3

If you look at the series without putting it in absolute values, does the graph look like this?