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Signals and Systems - Engineering

Q1:

Which one is a causal system?

A y(n) = 3x[n] - 2x[n - 1]

B y(n) = 3x[n] + 2x[n + 1]

C y(n) = 3x[n + 1] + 2x[n - 1]

D y(n) = 3x[n + 1] 2x[n - 1] + x[n]

ANS:A - y(n) = 3x[n] - 2x[n - 1]

For causal output must depend upon Present and past not on future.