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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]

Answer: A

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

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