Dave has been running every day to get in shape for the track season. He wants
to determine his average rate.
Dave learned the following formula in his
science class:
d = r. t
where
d = distance
r = rate
t = time

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236