Ononot — If A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix} and B =

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If $A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$ and $B = \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}$ , what is the entry $(AB)_{12}$ ?