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Signals & SystemsZ-Transform

For a right-sided sequence a^n u[n], the ROC is?

  • A|z|>|a|
  • B|z|<|a|
  • C|z|=|a| only
  • Dz=a only
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Correct Answer: A. |z|>|a|
Explanation: Convergence of the geometric series requires |az^-1||a|.
Reference: Standard signals and systems: z-transform
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