Using elementary row transformations, find the inverse of each of t...
Using elementary row transformations, find the inverse of each of the following matrices:
\( \mathrm{P} \)
\[
\left[\begin{array}{ccc}
-1 & 1 & 2 \\
1 & 2 & 3 \\
3 & 1 & 1
\end{array}\right]
\]
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