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\vbox{\halign{\bf#\hss\cr Math 226: Calculus IV\cr
Quiz 3\quad Feb.~2/4, 1993\cr
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1. Calculate the determinant of $\A =
\bmatrix{1&0&0&0&6\cr 0&2&0&7&0\cr 0&0&3&0&0\cr 0&8&0&4&0\cr 9&0&0&0&5}$.

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2. Let 
$\X_1 = [1,1,-1,-1]$,  $\X_2 = [0,2,0,3]$,  $\X_3 = [2,0,3,0]$, and
$\B = [9, -1, 11, -4]$. Find constants $c_1$, $c_2$, $c_3$ such that $c_1 \X_1 + c_2 \X_2 + c_3 \X_3 = \B$.


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