Signals and Systems Z Transform

The inverse z-transform of \(X\left( z \right) = \frac{1}{{1 - 1.5{z^{ - 1}} + 0.5{z^{ - 2}}}}\;for\;ROC\left| z \right| > 1\) is,

1
2 u(n) – (0.5)n u(n)
2
-2 u(-n - 1) – (0.5)n u(n)
3
2 u(n) + (0.5)n u(-n - 1)
4
-2 u(-n - 1) + (0.5)n u(-n - 1)

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