निम्नलिखित में से कौन सा एक मूल एकल-सर्वर क्यूइंग मॉडल (M/M/1) की मानक धारणा नहीं है?

Consider the M/M/1 queue in which customers arrive according to a Poisson process with rate 3 and successive service times are independent exponential random variables having mean 19. Let Pn be the long-run probability that there are exactly n customers in the system. Then, which of the following statements is true?

Consider an M/M/1 queue in which customers arrive according to a Poisson process with rate 3 and successive service times are independent exponential random variables having mean 1/9. Let Pn be the long-run probability that there are exactly n customers in the system. Then, which of the following statements is true?