Question

Which of the following pairs of numbers are co prime ?
$25$ and $105$

Answer 1

$25$ and $105$

The factors of $25$ are $1,5,25$

The factors of $105$ are $1,3,5,7,15,21,35,105$

The common factors of $25$ and $105$ are $1,5$

$\therefore$ They are not co-prime.