Question

Which pair of numbers is relatively prime?

A.
12 and 25

B.
24 and 45

C.
9 and 24

D.
18 and 39

Answer 1

two numbers are relatively prime if they have no common divisors other than 1. This is the case only for a) , the common divisor in other cases is:

b: 3

c: c

d: 18