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electronics and communication engineering signals and systems
1. Which one of the systems described by the following I/P - O/P relations is time invariant
(A): y(n) = n x(n)
(B): y(n) = x(- n)
(C): y(n) = x(n) - x(n - 1)
(D): y(n) = x(n) cos 2p f0n
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