CAA reported that 38% of car owners had bought used vehicles. 250 car owners were randomly selected. Give the exact expression for the probability of...

CAA reported that 38% of car owners had bought used vehicles.

a. 250 car owners were randomly selected. Give the exact expression for the probability

of exactly 45 had bought used vehicles.

b. What is the probability that the 4th used vehicle owner was the 7th owners asked by

CAA?