EC > GATE 2015 SET-1 > Signals and Systems
The pole-zero diagram of a causal and stable discrete-time system is shown in the figure. The zero at the origin has multiplicity 4. The impulse response of the system is h[n]. If h[0] = 1, we can conclude
A
h[n] is real for all n
B
h[n] is purely imaginary for all n
C
h[n] is real for only n = 0
D
h[n] is purely imaginary for n ≥ 1

Correct : a

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