Please use QM for Windows to solve the problem given below

Please use QM for Windows to solve the problem given below. A multiple-server queuing system with an infinite calling population and a first-come, first-served queue discipline has the following arrival and service rates: λ= the arrival rate = 50 customers per hour µ = the service rate = 20 customers per hour c = number of servers = 3 5. a. Determine the probability that there will be no waiting time for a customer. b. Determine the probability that there will be 2 customers in the system. c. Determine the probability that there will be less than or equal to 4 customers in the system.