Which among the following are the stable discrete time systems? 1. y(n) = x(4n) | y(n) = x(-n) | y(n) = ax(n) + 8 | y(n) = cos x(n)

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Which among the following are the stable discrete time systems? 1. y(n) = x(4n) | y(n) = x(-n) | y(n) = ax(n) + 8 | y(n) = cos x(n)