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4. (Dobrow 2.5) Consider a random walk on [0,., k), which moves left and right with respective probabilities q and p. If the walk is at 0 it transitions to 1 on the next step. If the walk is at k it transitions to k 1 on the next step. This is called random walk with reflecting boundaries. Assume that k 3, q1/4, p 3/4, and the initial distribution is uniform. (a) Find the transition matrix. (b) Find P(X7 1 Xo 3, X2 2, X42)

The answer is one of the following:

Answers (in random order): 0.6,-2,-1,0, 1,2),5/36, 19/64,15/17.1/3 1-p p 1-p 0 1 00 0 1-p 0 114 0 3/4 1/21/2), 2/31/3). 0 1-p 0 p 0 1-p p 0 010Please be descriptive! Thank you :)

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