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The determinant of the matrix $$\begin{bmatrix}7 &0 & 0 & 0 \\9 & 3 & 0 & 0 \\4 & -6 & -2 & 0 \\0 & 0 & 0 & 1 \end{bmatrix}$$ is
0
1
-42
-68
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