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a) First-come-first-served (FCFS): This is the most commonly used queuing model. In this system, customers are served in the exact order in which they arrive. It follows a chronological processing rule, where no customer is given priority over another, and there is no jumping of queue. FCFS is considered fair and simple to implement. The performance of this model depends on arrival and service _______ _________ ______ _________ __________ ____ ____ __________ __________ ______.
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