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Which of the following method is used to find the inverse z-transform of a signal?

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Which of the following method is used to find the inverse z-transform of a signal?

(a) Counter integration

(b) Expansion into a series of terms

(c) Partial fraction expansion

(d) All of the mentioned

I had been asked this question during an interview for a job.

The origin of the question is Inversion of Z Transform topic in section Z Transform and its Application – Analysis of the LTI Systems of Digital Signal Processing

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The correct choice is (d) All of the mentioned

The best I can explain: All the methods mentioned above can be used to calculate the inverse z-transform of the given signal.

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