(a) Can system S be time-invariant? Explain.
(b) Can system S be linear? Explain.
(c) Suppose (2) and (3) are input-output pairs of a particularsystem S2, and the system is known to be LTI. What ish[n], the impulse response of thesystem?
(d) Suppose (1) is the input-output pair of an LTI systemS3. What is the output of this system for the input inthe Figure above?
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