Question

The two numbers which have only $1$ as their common factor are called _______.

• A. co-primes
• B. twin primes
• C. composite
• D. none

Answer 1

The correct option is A co-primes

Numbers, which do not have any common factor between them other than one, are called co-prime number

And $1$ is a factor of all numbers, so it has $1$ as a common factor.

Hence, the answer is co-primes.