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A discrete-time signal $x[n] = \delta[n – 3] + 2 \delta[n – 5]$ has $z$-transform $X(z)$. If $Y(z) = X(-z)$ is the $z$-transform of another signal $y[n]$, then 

  1. $y[n] = x[n]$
  2. $y[n] = x[-n]$
  3. $y[n] = -x[n]$
  4. $y[n] = -x[-n]$
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