Question

Which pair of numbers is relatively prime?

a. 7 and 42
b. 16 and 39
c. 66 and 77
d. 90 and 891

Answer 1

16 and 39.....................

Explanation:

Answer 2

Two numbers are relatively prime if they have no factors in common. In other words, if their greatest common divisor is 1.
7 and 42- both divisible by 7
66 and 77- both divisible by 11
90 and 891- both divisible by 9
Answer would be 16 and 39