Signals and Systems

Q1:
A system with input x[n] and output y[n] is given as y[n] = (sin 5/6 pn) x(n) The system is

A linear, stable and invertible

B non-linear, stable and non-invertible

C linear stable, non invertible

D linear, unstable, invertible

ANS:C - linear stable, non invertible

Please explain?

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