Pb = __________(A^N * N) / N!(N-1)___________
Sum(n=0 to N) ((A^n / n!) + (A^N *N / N!(N-1))
Where
Pb: is Probability of a Blocked Call
A: call rate*call duration in units called Earlings named for A.K. Earling
N: Number of channels the line carries
n: number of callers
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