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The output signal when a signal x(n)=(0,1,2,3) is processed through an ‘Identical’ system is?

(a) (3,2,1,0)

(b) (1,2,3,0)

(c) (0,1,2,3)

(d) None of the mentioned

I had been asked this question in homework.

I need to ask this question from Discrete Time Systems in division Discrete Time Signals and Systems of Digital Signal Processing

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Right choice is (c) (0,1,2,3)

Explanation: An identical system is a system whose output is same as the input, that is it does not perform any operation on the input and transmits it.

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