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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 $G(F(1, 3), G(1, 3))$?

1. $2$
2. $4$
3. $6$
4. $36$

$F(1,3)=(1-3)^2=4$

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

$G(F(1,3),G(1,3))=G(4,2)=|4-2|=\color{Blue}2$

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