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For the discrete signal $x[n] = a^{n}u[n],a>0$ the $z$-transform is

1. $\frac{(z+a)}{z}$
2. $\frac{(z-a)}{z}$
3. $\frac{z}{(z-a)}$
4. $\frac{z}{(z+a)}$

1
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