Electronics and Communication Engineering - Exam Questions Papers - Discussion

22. 

Following information is given:

  1. x(z) has two poles at z = and z = - 1
  2. x(1) = 1, x(- 1) = 1
  3. ROC includes
Then x(n) is:

[A]. u(n) + (-1)n u(- n - 1)
[B]. 2 u(n) + (-1)n u(- n - 1)
[C]. 2 u(n - 1) + (-1)n - 1 u(- n)
[D]. None

Answer: Option B

Explanation:

No answer description available for this question.

Govind said: (Feb 12, 2017)  
X(-1) will be = -1 then only b is correct.

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