Adjoint of $\left[ \begin{matrix} 1 & 2 \\ 0 & -1 \\ \end{matrix} \right]$ is
Difficulty: Easy
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$\left[ \begin{matrix} -1 & -2 \\ 0 & 1 \\ \end{matrix} \right]$
$\left[ \begin{matrix} 1 & -2 \\ 0 & -1 \\ \end{matrix} \right]$
$\left[ \begin{matrix} -1 & 2 \\ 0 & -1 \\ \end{matrix} \right]$
$\left[ \begin{matrix} -1 & 0 \\ 2 & 1 \\ \end{matrix} \right]$
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