Multiple choice

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

  1. $|z| < \frac{5}{6}$
  2. $|z| > \frac{6}{5}$
  3. $\frac{5}{6} < |z| < \frac{6}{5}$
  4. $\frac{6}{5} < |z| < \infty$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation