Which one of the following systems is causal?

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answerhappygod
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Which one of the following systems is causal?

Post by answerhappygod »

a) y(t)=x(t)+x(t-3)+x(t2)
b) y(n)=x(n+2)
c) y(t)=x(t-1)+x(t-2)
d) y(n)=x(2n2)
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