Question: 12.13 Problems 249 earlier moves. Let Xn be her position after n moves. Show that (Xn : n 0) is a reversible Markov chain,

12.13 Problems 249 earlier moves. Let Xn be her position after n moves. Show that (Xn : n ≥ 0) is a reversible Markov chain, and find its invariant distribution.

What is the mean number of moves before she returns to her starting square?

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