Equations of stable discrete time systems

Q.  Which among the following are the stable discrete time systems?

1. y(n) = x(4n)
2. y(n) = x(-n)
3. y(n) = ax(n) + 8
4. y(n) = cos x(n)
- Published on 30 Nov 15

a. 1 & 3
b. 2 & 4
c. 1, 3 & 4
d. 1, 2, 3 & 4

ANSWER: 1, 2, 3 & 4

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