Functions $F(a,b)$ and $G(a,b)$ are defined as follows:

$F(a,b)=(a-b)^{2}$ and $G(a,b)=\mid a-b\mid ,$ where $\mid x\mid$ represents the absolute value of $x.$

What would be the value of $G(F(1,3),G(1,3))?$

F(1,3) = (1 - 3)^{2} = (-2)^{2} = 4

G(1,3) = |1 - 3| = |-2| = 2

G(4,2) = |4 - 2| = |2| = 2

Hence, A is correct :)

Gatecse