Question

Under what specific condition are two numbers classified as co-prime?

Options

• If they are both odd numbers.

• If the numbers are both prime.

• If they share no common prime factors.

• If their prime factorisations are identical.

Answer 1

If they share no common prime factors.

Explanation:

Two numbers are coprime when they do not have any common prime factors.

This means that after doing the prime factorisation of both numbers, no prime number appears in both lists.