To which subset of real numbers does the number 1/5 belong?
a. irrational numbers
b. rational numbers
c. inverse property of multiplication
d. whole numbers, natural numbers, integers

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