Question

determin weather the series absolutly convergent

Answer 1

\[\sum_{n=1}^{\infty} b^nn cosn \Pi/n\]

Answer 2

\[\sum_{n=1}^\infty \frac{b^n~n~\cos (n\pi)}{n}~~?\]

Answer 3

Are you certain you've typed the problem in correctly? It appears that you have n in both numerator and denominator, implying that you could cancel them out. Please double check the original problem and re-post your question if necessary.