1.

The z-transform of \((\frac{1}{4})^n\) (u[n] – u[n-5]) is __________

A. \(\frac{z^5 – 0.25^5}{z^4 (z-0.25)}\), z>0.25
B. \(\frac{z^5 – 0.25^5}{z^4 (z-0.25)}\), z>0
C. \(\frac{z^5 – 0.25^5}{z^3 (z-0.25)}\), z<0.25
D. \(\frac{z^5 – 0.25^5}{z^4 (z-0.25)}\), all z
Answer» E.


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