This equation computes the probability that there are no units in the system (`P_n` for n = 0) for the case of a single server model (s = 1) with exponential service time, M = `oo`.
`P_0` = 1 - `lambda`/`mu` = 1 - `rho` , where
`lambda` = mean arrival rate
`mu` = mean service rate
`rho` = service utilization factor
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