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Quiz 1\quad Jan.~19/21, 1993\cr
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1. Let $A = \bmatrix{3 & -1 \cr 7 & 2\cr 1 & 1\cr}$,
$B \bmatrix{0 & 2\cr 3 &0 \cr}$, and $C = \bmatrix{-1 & 1\cr 1 & -1\cr}$.
Compute $A\cdot (B - C)$.


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2. Reduce the matrix $A = \bmatrix{1 & -1 & 1\cr 2 & 1 & -3\cr 5 & 1 & -5\cr}$ to echelon form.

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