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GATE ECE 2005 | Question-6

The region of convergence of $Z$-transform of the sequence
$\left(\frac{5}{6}\right)^{n} u(n)-\left(\frac{6}{5}\right)^{n} u(-n-1)$ must be

  1. $|z|<\frac{5}{6}$
  2. $|z|>\frac{6}{5}$
  3. $\frac{5}{6}<|z|<\frac{6}{5}$
  4. $\frac{6}{5}<|z|<\infty$
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