Suppose that 18 customers stand in a line at a boxoffice, nine with $5 bills and nine with $10 bills. Each ticket costs $5, and the box office has no money initially. Write a simulation program to...

Suppose that 18 customers stand in a line at a boxoffice, nine with $5 bills and nine with $10 bills. Each ticket costs $5, and the box office has no money initially. Write a simulation program to calculate an approximate value for the probability that none of the customers has to wait for change.