The element in the first row and third column of the inverse of the matrix \( \left[\begin{array...

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The element in the first row and third column of the inverse of the matrix \( \left[\begin{array}{ccc}1 & 2 & -3 \\ 0 & 1 & 2 \\ 0 & 0 & 1\end{array}\right] \) is
\( \mathrm{P} \)
VV
(1) \( -2 \)
(2) 0
(3) 1
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