7. Verify the associative property of matrices

Answer variants:

$\left[\begin{array}{ll}336& 694\\ 154& 331\end{array}\right]$

$\left[\begin{array}{ll}20& 45\\ 27& 53\end{array}\right]$

$\left[\begin{array}{ll}336& 694\\ 154& 331\end{array}\right]$

$\left[\begin{array}{ll}54& 76\\ 41& 17\end{array}\right]$

Show that $A(BC) = (AB)C$ if $A =\begin{bmatrix} 6 & 8\\ 5 & 2 \end{bmatrix}, B = \begin{bmatrix} 1 & 6\\ 6 & 5 \end{bmatrix}, C = \begin {bmatrix} 2 & 3\\ 3 & 7 \end{bmatrix}$