Question: Discrete-Time Version of the M/M/1 System. Consider a queueing system where interarrival and service times are integer valued, so customer arrivals and departures occur at integer times. Let λ be the probability that an arrival occurs at any time k, and assume that at most one arrival can occur. Also let μ, be the probability that a customer who was in service at time k will complete service at time k + 1. Find the occupancy distribution pn in terms of λ and μ.