Question

If $A=\{1,2,3,4,5\}$ and $R$ is a relation in $A$ defined as $(x,y)\in R$ and $x$ is a factor of $y$.Write $R$ in Roster form.

Answer 1

$A=\{1,2,3,4,5\}$

$R=\{(x,y):xisafactor,y\}$

$R=\{(1,2),(1,3),(1,4),(1,5),(2,2),(2,4)\}$