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1. Determinant of a 4×4 matrix ●●○○○ 20 ptsFind the determinant of the matrix $$A=\begin{pmatrix}1 & -1 & 0 & 2 \\ 3 & 1 & 4 & 1 \\ 0 & 0 & 1 & -3 \\ 1 & -1 & 0 & 4\end{pmatrix}.$$