How to find the distribution from a given form of generating function

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I have the generating function defined by F(x)= $\sum P(n,s) x^n$ . And the expression for F(x) is given by $F(x)= e^{\frac{a}{b}x} (1-x)^{b/s}$. Then how can i find p(n,s) function..? Can anybody solve this problem.?