Question

Which of the following pair is co-prime?

• A. 7 and 35
• B. 6 and 8
• C. 18 and 35
• D. 30 and 415

Answer 1

The correct option is C 18 and 35

Two natural numbers are called co-prime numbers if they do not have a common factor other than 1.

7 and 35 has 7 as common factor.

6 and 8 has 2 as common factor.

18 and 35 has no common factor other than 1.

30 and 415 has 5 as common factor.

Therefore, 18 and 35 are co-prime numbers.