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 ....
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]