50-50% chance to increase by 1 or remain unchanged. - If there are 2 students in a lab, then the number of students in 1 hour has a 50-50% chance to decrease by 1 or remain unchanged.  (a) Write the transition probability matrix for this Markov chain. (b) Suppose there is nobody in the lab at 7 am. What is the probability of nobody working in the lab at 10 am

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