5 The matrices \(\mathbf { A } , \mathbf { B }\) and \(\mathbf { C }\) are given by \(\mathbf { A } = \left( \begin{array} { l } 3
1
2 \end{array} \right) , \mathbf { B } = \left( \begin{array} { l } 4
0
3 \end{array} \right)\) and \(\mathbf { C } = \left( \begin{array} { l l l } 2 & 4 & - 1 \end{array} \right)\). Find

1. \(\mathbf { A } - 4 \mathbf { B }\),
2. BC ,
3. CA .