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What is the ROC of a causal infinite length sequence?

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What is the ROC of a causal infinite length sequence?

(a) |z|<r1

(b) |z|>r1

(c) r2<|z|<r1

(d) None of the mentioned

I have been asked this question in exam.

My question is taken from Z Transform topic in division Z Transform and its Application – Analysis of the LTI Systems of Digital Signal Processing

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Correct answer is (b) |z|>r1

Easy explanation: The ROC of causal infinite sequence is of form |z|>r1 where r1 is largest magnitude of poles.

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