1.

Which one of the following systems is causal?

A. y(t)=x(t)+x(t-3)+x(t<sup>2</sup>)
B. y(n)=x(n+2)
C. y(t)=x(t-1)+x(t-2)
D. y(n)=x(2n<sup>2</sup>)
Answer» D. y(n)=x(2n<sup>2</sup>)


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