Bank of America customers select their own three-digit personal identification number (PIN) for use at ATMs.

Assuming that the first digit cannot be a zero, compute the number of possible outcomes when the digits can be repeated.

Assuming that the first digit cannot be a zero, compute the number of possible outcomes when the digits cannot be repeated.

(b) If zero can be the first digit and the numbers can be repeated, what is the probability Mr. Jones and Mrs. Smith select the same PIN? (Round your answer to 3 decimal places.)

(c) Which concept of probability did you use to answer requirement 2?