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Quiz 2\quad Jan.~26/28, 1993\cr
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1. Find the inverse of the matrix $A = \bmatrix{1&2&3\cr 0&1&4\cr 0&0&1\cr}$.

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2. Solve the system of equations associated to the augmented matrix
$$A = \bmatrix{1&-1&2&1&0&:&3\cr 0&0&1&1&-5&:&4\cr 0&0&0&1&-3&:&1\cr}$$




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