Oplossing week 9
$\begin{array}{l}
a.\,\,\,\left( {\begin{array}{*{20}{c}}
7\\
2
\end{array}} \right) \cdot \left( {\begin{array}{*{20}{c}}
5\\
2
\end{array}} \right) = 210\\
b.\,\,\,7 \cdot \left( {\begin{array}{*{20}{c}}
5\\
2
\end{array}} \right) + \left( {\begin{array}{*{20}{c}}
7\\
2
\end{array}} \right) \cdot 5 = 175
\end{array}$