23. By the method in Prob. 22, find the inverse of I - A where $$A =...

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23. By the method in Prob. 22, find the inverse of I - A where

$$A = \begin{bmatrix}

0 & 1 & -1 \\

0 & 0 & 2 \\

0 & 0 & 0

\end{bmatrix}$$

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