Multiple choice

Let x [n] = $\bigg(- \frac{1}{9} \bigg)^n$ u (n) – $\bigg(- \frac{1}{3} \bigg)^n$ u (– n – 1). The Region of Convergence (ROC) of the z-transform of x [n]

  1. is |z| > $\frac{1}{9}$
  2. is |z| < $\frac{1}{3}$
  3. is $\frac{1}{3}$ > |z| > $\frac{1}{9}$
  4. Does not exist

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation