EC > GATE 2016 SET-1 > Z-transform
Consider the sequence x[n]=anu[n]+bnu[n], where u[n] denotes the unit-step sequence and 0<|a|<|b|<1. The region of convergence (ROC) of the z-transform of x[n] is
A
|z|>|a|
B
|z|>|b|
C
|z|<|a|
D
|a|<|z|<|b|

Correct : b

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