The residues of a complex function \({\rm{X}}\left( {\rm{z}} \right) = \frac{{1 - 2{\rm{z}}}}{{{\rm{z}}\left( {{\rm{z}} - 1} \right)\left( {{\rm{z}} - 2} \right)}}{\rm{\;}}\)at its poles are
1
\(\frac{1}{2},{\rm{\;}} - \frac{1}{2}{\rm{\;and\;}}1\)
2
\(\frac{1}{2}, - \frac{1}{2}{\rm{\;and}} - 1\)
3
\(\frac{1}{2},{\rm{\;}}1{\rm{\;and}} - \frac{3}{2}\)
4
\(\frac{1}{2},{\rm{\;}} - 1{\rm{\;and}}\frac{3}{2}\)