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A system with input $x[n]$ and output $y[n]$ is given as $y[n]=\left(\sin \frac{5}{6} \pi n\right) x(n)$.
The system is

  1. linear, stable and invertible
  2. non-linear, stable and non-invertible
  3. linear, stable and non-invertible
  4. linear, unstable and invertible
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