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             \begin{vmatrix} 2 & 4\\ -5 & -1\end{vmatrix}

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The determinant is evaluated as follows

 \begin{vmatrix} 2 & 4\\ -5 & -1\end{vmatrix} = 2(-1) - 4(-5) = -2 + 20 = 18

Posted by

Divya Prakash Singh

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