First, in M/M/1 Queuing System the arrival rate is and service rate is , prove that L= - if we have = . Second, explain under what conditions ( and how) the above relationship can be obtained from the following equation: Eq. 1 = + (-+) (-) Note that the above formula considers the L (mean number of customers in the system) in M/G/1 queue model. Third, describe the situation in Eq.1 that s be equal to 0.