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The first-come-first-served queuing model is the most widely used and simplest form of service discipline. In this model, customers are served strictly in the order in which they arrive. It ensures fairness, as no customer is given preference over another, and waiting time is distributed based on arrival sequence. This discipline is commonly observed in ticket counters, bank queues, and supermarkets. Its main advantage is simplicity and predictability, but it may not be ___ ______ ____ ____ ________ _________ _____ _________ ________.
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