- #1

- 678

- 4

## Homework Statement

From the given ans , i knew that it's conditionally convergent (by using alternating test) i can understand the working to show that it's conditionally convergent . But , i also wanna show it as not absolutely convergent ....

## Homework Equations

## The Attempt at a Solution

to prove that the series is not absolutely convergent , we would use ratio test , when the ratio is bigger than 1 , the series is said to be not absolutely convergent

however , i gt 1 (there's no conclusion whether the series is absolutely convergent or not )[/B]

https://en.wikipedia.org/wiki/Ratio_test