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\textbf{Math 228: Intro to Lin Alg \& Diff Eqns}
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\textbf{Quiz 3}\quad \textsl{Feb. 7, 2002}
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1. Compute the determinant of the matrix
$\left[\begin{array}{cccc}
 1& 2&-1& 0\\
-1& 1& 0&-1\\
 0&-1& 2& 1\\
-1& 3& 1&-1
\end{array}\right]$

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2. Find the (3,2)-cofactor of the matrix
$\left[\begin{array}{cccc}
 2&-1& 0& 0\\
-1& 2&-1&-4\\
 0&-3& 2& 0\\
 0&-1& 0& 2
\end{array}\right]$


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