If \( \mathrm{A}=\left[\begin{array}{lll}1 & 0 & 1 \\ 0 & 1 & 2 \\ 0 & 0 &am...

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If \( \mathrm{A}=\left[\begin{array}{lll}1 & 0 & 1 \\ 0 & 1 & 2 \\ 0 & 0 & 4\end{array}\right]\), then show that \( |3 \mathrm{~A}|=27|\mathrm{~A}| \)
 
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