g is holomorphic on the open unit ball and continuous on

the closure\ z_{0}. this pt z_{0}is on the boundary. if g has

expansion about 0 of form $\displaystyle \sum a_n x^n$ then

prove that $\displaystyle \lim_{n\to\infty} \frac{a_n}{a_{n+1}} = z_0$

any sort of hints would be helpful, seems like it is asking

for the 1 over the limit of ratio test for the series at 1.

still not sure how to relate this to z_{0}