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youtu
Answers (2)
Because you have to think it as 2 Poissons, one from t to the next arrival and one from to to the previous arrival (reverse time). So you sum the expected length of the interval of both.
Why number 3 is not (rbe^-(r+b))/2 ? I get this other answer doing (r/(r+b))*(b/(r+b))*(((r+b)^2)*e^-(r+b))/2 P(A/\B) = P(B)*P(A|B)
