1.

Which of the following system is both causal and stable?

A. y[n] = x[n] + x[n – 1] + x[n + 1]
B. 2y[n] – y[n – 1] = 2 x[n]
C. y[n] – 2y[n – 1] = x[n]
D. y[n] + 2y[n – 1] = x[n]
Answer» C. y[n] – 2y[n – 1] = x[n]


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