An access code consists of a letter followed by four digits. Any letter can be used, the

Question:

An access code consists of a letter followed by four digits. Any letter can be used, the first digit cannot be 0, and the last digit must be even.
(a) Find the number of possible access codes.
(b) What is the probability of randomly selecting the correct access code on the first try?
(c) What is the probability of not selecting the correct access code on the first try?