(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://img128.imageshack.us/img128/2010/95701129si7.png [Broken]

3. The attempt at a solution

If I define [tex]Z_n = \frac{X_n}{n+2} [/tex] with X_{n}the number of white balls in stage n then how can I prove that it's martingale?

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# Homework Help: Martingale & Probability

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