If the relation $R : A \to B,$where $A=\left\{1, 2, 3, 4\right\}$ and $B=\left\{1, 3, 5\right\}$ is defined by $R=\left\{\right(x,y):x<y,x\in A,y\in$$B\}$ then $Ro{R}^{-1}$ is

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

and $R^{-1}=\left\{\right(3,1), (5,1), (3,2), (5,2), (5,3), (5,4\left)\right\}$

Thus $Ro{R}^{-1}=\left\{\right(3,3), (3,5), (5,3), (5,5\left)\right\}$