$$\left[ \begin{array} { l l } { 2 } & { 4 } \\ { 2 } & { 5 } \end{array} \right]$$
$2$
$$det(\left(\begin{matrix}2&4\\2&5\end{matrix}\right))$$
$$2\times 5-4\times 2$$
$$10-4\times 2$$
$$10-8$$
$$2$$
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$\left(\begin{matrix}2&4\\2&5\end{matrix}\right)$
