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GATE2018-2-26

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Let $z$ be a complex variable. For a counter-clockwise integration around a unit circle $C$, centered at origin, $$\oint_C \frac{1}{5z-4} dz=A \pi i$$, the value of $A$ is

  1. $2/5$
  2. $1/2$
  3. $2$
  4. $4/5$

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