how do i find wheter this is absolute or conditional convergence, can someone offer some guide & advice,thank you so much. im out of ideas for this.

i)$\displaystyle \sum^\infty _{n=1}$$\displaystyle \frac {sin(\frac {n\pi}{2})}{n!}$

ii)$\displaystyle \sum^\infty _{n=1}$$\displaystyle (-1)^n \frac {n}{ln n}$

thank you.