In a preemptive priority system, the lowest-priority customer being served is ejected back into the queue whenever a higher-priority customer enters the queueing system.

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In a preemptive priority system, higher-priority customers can interrupt or preempt the service of lower-priority customers. This means that the lowest-priority customer being served may be ejected back into the queue whenever a higher-priority customer enters the system.

In a Preemptive Priority System, the Lowest-Priority Customer Being Served