I need help please figuring out the answers to problem a and b. Thank you!

B12 B D E F G H I J K L M N O P Q R S 10 Arrival rate (0) = Service rate (u) = Number of servers = C 10 per hour 4 per hour 3 Multiple-server waiting line with exponential service times 12 =probability no customers in system PO Denominator Calculations (for up to and including 6 servers) 2.5 3.125 15.625 0 0 0 PO = 0.04494 P1 = 0.11236 Pacchetta "p, for 1> or n or n