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Find the determinant of 

\n

\\begin{bmatrix}\\var{n11}&\\var{n12}&\\var{n13}\\\\ \\var{n21}&\\var{n22}&\\var{n23}\\\\ \\var{n31} & \\var{n32} & \\var{n33}\\end{bmatrix}

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The first element in the 3x3 matrix

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Number in 1st row 2nd column

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