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The ROC of z-transform of the discrete time sequence x left(...

This question belongs to Electronics And Communications Engineering Signal Processing
Signal Processing
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The ROC of z-transform of the discrete time sequence
$$x\left( n \right) = {\left( {{1 \over 3}} \right)^n}u\left( n \right) - {\left( {{1 \over 2}} \right)^n}u\left( { - n - 1} \right)$$       is

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Correct Answer: Option A
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