Question

Consider a post office with two clerks. Three people, A, B, and C, enter simultaneously. A and B go directly to the clerks, and C waits until either A or B leaves before he begins service. What is the probability that A is still in the post office after the other two have left when the service time for each clerk is exactly (nonrandom) five minutes?

Answer 1

0

Explanation:

-Given that the service time for each clerk is 5 mins:

A can only be the last the to leave if he/she is still in the post office after 10 minutes. 10>5:

Hence, the probability that A is still in the post office after the other two have left is 0