Arrange the ROC's if sequence is:

 

41. Arrange the ROC's if sequence is:

(a) Causal, finite
(b) Anticausal finite
(c) Causal infinite
(d) Anticausal infinite

respectively

1. Entire Z plane except Z = 0
2. Outside the radius |r|
3. Inside the radius |r|
4. Entire Z plane except Z = ∞

Choose the correct answer from the options given below:

• 1. A, B, C, D
• 2. B, C, A, D
• 3. A, D, B, C
• 4. B, C, D, A

Answer: 3

Solution

• Causal finite → All Z except 0.
• Anticausal finite → All Z except infinity.
• Causal infinite → |z| > r.

Order: A, D, B, C.

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