Question

Whether the given pair of numbers $16$ and $21$ are co-prime?

Answer 1

We know that, co-prime numbers are those who are having $1$ as the only common factor.

Let’s first find the factors of $16$ and $21$

Factors of $16$are $1,2,4,8,$ and $16$.

Factors of $21$are $1,3,7,$ and $21$.

Here, we can observe clearly that $1$ is the only common factor of $16$and $21$.

Therefore, $16$ and $21$ are co-prime.