For problem please click on the following link:

http://www.ofoto.com/PhotoView.jsp?UV=259904767712_68781264605&collid=84330264605&photoid=74330264605&page=1

For raw =1, it means that arrival rate, lambda, and departure rate,
mu, both are equal. So rate of 'filling' of queue is same as rate of
'emptying' of queue. For N capacity queue, it means that person coming
after first N person will not be allowed to join a queue. That is one
in N+1 person will not be able to join the queue. Under uniform and
steady state condition, blocking probability will be 1 over (N+1) for
this special case of raw=1.