In a nonpreemptive priority system, customers are served in the order in which they arrive in the queue.

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In a nonpreemptive priority system, customers are served based on their priority level, regardless of the order in which they arrived in the queue. The priority level is determined by some predefined criteria such as the type of customer, type of service requested, urgency of the service, etc. Preemption allows higher priority customers to jump ahead of lower priority customers in the queue, even if the lower priority customers arrived first.

In a Nonpreemptive Priority System, Customers Are Served in the Order