Yes.

Consider a post office with two clerks. Three people, A, B, and C, enter at the

same time. A and B go directly to the clerks, and C waits until either A or B

leaves before he begins service. What’s the probability that A is still in the post

office after the other two have left, i.e., P(A > B + C), when. . . ?

A)The service times are i.i.d. Exp(µ)

B) service times are independent and exponentially distributed with rate λ?