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Which one is a causal system? | |
A. | y(n) = 3x[n] - 2x[n - 1] [Correct Answer] |
B. | y(n) = 3x[n] + 2x[n + 1] [Wrong Answer] |
C. | y(n) = 3x[n + 1] + 2x[n - 1] [Wrong Answer] |
D. | y(n) = 3x[n + 1] 2x[n - 1] + x[n] [Wrong Answer] |