If \( A=\left[\begin{array}{rr}4 & 2 \\ -1 & 1\end{array}\right] \)...

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If \( A=\left[\begin{array}{rr}4 & 2 \\ -1 & 1\end{array}\right] \), prove that \( (A-2 I)(A-3 I)=0 \).
\( \mathrm{P} \)
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