3 The matrix \(\mathbf { M }\) is given by \(\mathbf { M } = \left( \begin{array} { l l l } 2 & 1 & 3
1 & 2 & 1
1 & 1 & 3 \end{array} \right)\).
- Find the value of the determinant of \(\mathbf { M }\).
- State, giving a brief reason, whether \(\mathbf { M }\) is singular or non-singular.