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The sum of residues of text f left( text z right)...

This question belongs to Engineering Maths Complex Variable
Complex Variable
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The sum of residues of $${\text{f}}\left( {\text{z}} \right) = \frac{{2{\text{z}}}}{{{{\left( {{\text{z}} - 1} \right)}^2}\left( {{\text{z}} - 2} \right)}}$$    at its singular point is

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Correct Answer: Option C
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