question_answer

If the arrival rate of units is X and the service rate is u for a waiting line system having 'm' number of service stations, then the probability of services unit being turned out in the time interval, \[(t+\nabla t):\]

A) Zero                             

B) \[\mu .\nabla .t\]

C) \[m\,\mu .\nabla .t\]                   

D) \[n\,\mu .\nabla t\]