railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Signals and Systems Z Transform

The z-transform of x(n) = δ[n -1] – 2δ[n +1] + δ[n - 3] is:

1
z-1 – 2z + z-3
2
z-1 + z3
3
z-1 – 2z + z3
4
z-1 + 2z + z-3
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