Question

$A=\{1,2,3,5\}$ and $B=\{4,6,9\}$. Define a relation $R$ from $A$ to $B$ by $R=\left\{\right(x,y):$ the difference between $x$ and $y$ is odd $x\in A,y\in B\}$. Write $R$ in roster form

Answer 1

$A=\{1,2,3,5\}$ and $B=\{4,6,9\}$
$R=\left\{\right(x,y):\text{the difference between x and y is odd}x\in A,y\in B\}$
$\therefore R=\left\{\right(1,4),(1,6),(2,9),(3,4),(3,6),(5,4),(5,6\left)\right\}$