Ononot — What is the cofactor C{11} of A = \begin{pmatrix} 1 & 2 & 3

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What is the cofactor $C_{11}$ of $A = \begin{pmatrix} 1 & 2 & 3 \\ 0 & 4 & 5 \\ 0 & 0 & 6 \end{pmatrix}$ ?