A causal LTI system is described by the difference equation—

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A causal LTI system is described by the difference equation—
2y[n] = αy[n – 2] – 2x[n] + βx[n – 1]
The system is stable only if—

1. [α] = 2, |β| < 2
2. |α| = 2, |β| < 2
3. |α| = 2, | any value of β
4. |β| > 2, any value of α

Correct Option: D

NA