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4. Consider an irreducible Markov chain with finite state space S = {0, 1, , (a) Starting at state i, what is the probability that it will ever visit state j? (i,j arbi trary (b) Suppose that Xjj iyi for al i. Let ai P(visit N before 0 start at i). Show uations that the r, satisfy, and show that Xi . H2nt: Derive a system of linear eq that xi- solves these equations

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