1. The problem statement, all variables and given/known data Is this an alternating series : (-1)^n / ( arctan n ) ^ (n) 2. Relevant equations I know that the alternating series should have (-1) to any power, but also the signs should be - , + , - , + ..... or the opposit, 3. The attempt at a solution I am ok with this I know that for testing Con. Or Div. of this we should use the root test But this series. But the problem is " Is this seris alternating or not" Becasue if not it will be treated normally with a root test and it will Con. For me I think that it is not "Alternating " What do you think ?