Question: 29. Poisson () arrivals join a queue in front of two parallel servers A and B, having exponential service ratesI mage andI mage (see Fig.

29. Poisson (λ) arrivals join a queue in front of two parallel servers A and B, having exponential service ratesI mage andI mage (see Fig.

8.4). When the system is empty, arrivals go into server A with probability α and into B with probability . Otherwise, the head of the queue takes the first free server.

(a) Define states and set up the balance equations. Do not solve.

(b) In terms of the probabilities in part (a), what is the average number in the system? Average number of servers idle?

(c) In terms of the probabilities in part (a), what is the probability that an arbitrary arrival will get serviced in A?

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