EC > GATE 2015 SET-3 > Z-Transform
Suppose x[n] is an absolutely summable discrete-time signal. Its z-transform is a rational function with two poles and two zeroes. The poles are at z = ± 2j. Which one of the following statements is TRUE for the signal x[n]?
A
It is a finite duration signal.
B
It is a causal signal.
C
It is a non-causal signal.
D
It is a periodic signal.

Correct : c

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