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What is the period of a signal x(t)?

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What is the period of a signal x(t)?

(a) T

(b) 2T

(c) T/2

(d) None of the mentioned

The question was posed to me in an interview for internship.

I'd like to ask this question from Classification of Signals in section Signals and Spectra of Digital Communications

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Right choice is (a) T

The best I can explain: A signal is said to be periodic if the duration of one complete cycle is T and it repeats itself after this duration.

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