18/11/27 09:59:56.71 WzO5TT32.net
MMS = function(n, λ=1/20,μ=1/10,s=3){
ρ=s*λ/μ
sig=0
for(i in 0:s) sig=sig+ρ^i/factorial(i)
p0=1/( sig + ρ^(s+1)/factorial(s)/(s-ρ) )
ifelse(n >= s, ρ^n/factorial(s)/s^(n-s)*p0, ρ^n/factorial(n)*p0)
}
1-sum(sapply(0:3,MMS))