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Problem
The element in the first row and third column of the inverse of the matrix
[
1
2
−
3
0
1
2
0
0
1
]
\begin{bmatrix} 1 & 2 & -3 \\ 0 & 1 & 2 \\ 0 & 0 & 1 \end{bmatrix}
1
0
0
2
1
0
−
3
2
1
is a. -2 b. 0 c. 1 d. None of these
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