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25-09-2021 Signals & Systems

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

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

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Dapzoi Verified
Commented on 2021-09-25 13:09:29 (IST)
Answer: C

Explanation: For positive time, the system may seem to be causal. However, for negative time, the output depends on time at a positive sign, thus being in the future, enforcing non causality.