For the tandem queue model verify that Pn,m = (/1) n(1 /1)(/2) m(1 /2) satisfies

For the tandem queue model verify that Pn,m = (λ/μ1)

n(1 − λ/μ1)(λ/μ2)

m(1 − λ/μ2)

satisfies the balance Equation (8.15).