Linear algebra/Determinant quiz

{ The determinant of $$\left[\begin{array}{c c}3 & 4 \\2 & 1\end{array} \right]$$ is { -5 _3 }.
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{ The determinant of $$\left[\begin{array}{c c}0 & -2 \\6 & 2\end{array} \right]$$ is { 12 _3 }.
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{ The determinant of $$\left[\begin{array}{c c c}3 & -2 & -1 \\1 & 1 & -2 \\8 & -5 & 3\end{array} \right]$$ is { 30 _3 }.
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