Question

Which of the following pair of numbers is co-prime ? 

(A) 8 and 14 

(B) 6 and 35 

(C) 4 and 12 

(D) 9 and 19

Answer 1

Correct option is (B) 6 and 35

Two integers are said to be co-prime if their HCF is 1.

(A) HCF (8, 14) = 2 \(\neq\) 1

\(\therefore\) 8 & 14 are not co-primes.

(B) HCF (6, 35) = 1

\(\therefore\) 6, 35 are co-prime numbers.

(C) HCF (4, 12) = 3

\(\therefore\) 4, 12 are not co-primes.

(D) HCF (9, 18) = 9

\(\therefore\) 9, 18 are not co-primes.

Answer 2

Correct option is (B) 6 and 35