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Sep 8, 2013 at 8:07 comment added user1748601 Thank you. Your answer is correct. To finish it off, define $n=xy$. Taking $\lim_{n\rightarrow\infty}{(\frac{y-1}{y})^x}=e^{-\frac{x}{y}}$.
Sep 8, 2013 at 8:01 vote accept user1748601
Sep 8, 2013 at 3:12 history answered Lucia CC BY-SA 3.0