If A=1-12, B=1-12113, C=122-1 show that(AB)C = A(BC).

If $A = (\begin{matrix} 1 & - 1 & 2 \end{matrix}), B = (\begin{matrix} 1 & - 1 \\ 2 & 1 \\ 1 & 3 \end{matrix}), C = (\begin{matrix} 1 & 2 \\ 2 & - 1 \end{matrix})$ show that(AB)C = A(BC).

Match the items on the right to the items on the left.