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25-09-2021 Signals & Systems

Q. Comment on the causality of y[n] = n*x[n].

A. Time invariant
B. Time varying
C. Non causal
D. Causal

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Dapzoi Verified
Commented on 2021-09-25 13:10:11 (IST)
Answer: D

Explanation: For positive time, the system may seem to be causal. For negative time, the output depends on the same time instant, thus making it causal.