In Exercises 5–30, express all probabilities as fractions.

5.Pin Numbers The Kinsale Medical Supply Company issues pin numbers to its employees so that they can access an online database. A hacker must randomly guess the correct pin code for the Information Technology supervisor, and that pin code consists of four digits (each 0 through 9) that must be entered in the correct order. Repetition of digits is allowed. What is the probability of a correct guess on the first try?