# Math Help - series, radius of convergance and interval of convergance

1. ## series, radius of convergance and interval of convergance

am having trouble with this particular problem

the sum from 0 to infinity of (n!)^k/(kn)! * X^n

can someone also explain the ! factorial part to me please also

thank you very much

2. $\lim_{n\rightarrow\infty} \frac{n!^k}{(kn)!} * x^n$

Try the Ratio Test.

3. Originally Posted by lilaziz1
$\lim_{n\rightarrow\infty} \frac{n!^k}{(kn)!} * x^n$

Try the Ratio Test.

should i include X^n also in the ratio test??