1.

In the Laurent expansion of \(f\left( z \right) = \frac{1}{{\left( {z - 1} \right)\left( {z - 2} \right)}}\) valid in the region 1 < |z| < 2, the co-efficient of \(\frac{1}{{{z^2}}}\) is

A. 0
B. 1/2
C. 1
D. -1
Answer» E.


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