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I've got a box with 10 balls inside, 5 reds 5 blacks. Every step i take a ball. If it is black i hold it out, if it is red i put all the blacks ball that are out and the red one inside the box. Called $X_{n}$ the number of balls that are outside the box at the n° step, prove that $X_n$ is a markov chain.

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    Since this is homework, please edit to show what you have done so far. What part of the definition of a Markov chain are you having trouble verifying?2012-01-13

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