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I think TA's solution #3.b is wrong.

I think the graph of x[n-k] is wrong.

X-axis should represent n+1, n+2, n+3, ...., n+10.

So, the answer should be

0 , n<-10 n+11, -10=<n<-1 9-n, -1=<n=<8 0, 8<n

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Questions/answers with a recent ECE grad

Ryne Rayburn