engineering recuitment BEL Probationary Engineers Mock Test 2025 Signals and Systems Z Transform

Find the Z-transform of a periodic sequence x(n) = {2, 0, -6, 2}?

1
X(z) = 2 – 6z-2 + 2z-3; |z| ≠ 0
2
X(z) = 2 – 6z-2 + 2z-3; |z| ≠ ∞ 
3
X(z) = 2 – 6z-2 + 2z-3; |z| ≠ 0 and |z| ≠ ∞
4
X(z) = (2 – 6z-2 + 2z-3)/(1 – z-4)
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