determine if the series is absolutely convergent, conditionally convergent or divergent
1- ∑ (-1) √ln(n) / n
2- sin√n / √n^2+1
Q2) find the interval of convergence abd radius of convergence:
∑ (x-1)^n / n √n
And if you'd taken my suggestion, shown some effort and attempted the questions yourself, shown where you were stuck, you would have gotten some help. You have nobody to blame but yourself.
I suggest you read my signature...