1.

The z-transform of x[n]= {2,4,5,7,0,1} (5 as the reference variable) is ___________

A. 2z2 + 4z + 5 +7z + z3, z≠∞
B. 2z-2 + 4z-1 + 5 + 7z + z3, z≠∞
C. 2z-2 + 4z-1 + 5 + 7z + z3, 0<|z|<∞
D. 2z2 + 4z + 5 + 7z-1 + z3, 0<|z|<∞
E. is ___________a) 2z2 + 4z + 5 +7z + z3, z≠∞b) 2z-2 + 4z-1 + 5 + 7z + z3, z≠∞c) 2z-2 + 4z-1 + 5 + 7z + z3, 0<|z|<∞d) 2z2 + 4z + 5 + 7z-1 + z3, 0<|z|<∞
Answer» E. is ___________a) 2z2 + 4z + 5 +7z + z3, z≠∞b) 2z-2 + 4z-1 + 5 + 7z + z3, z≠∞c) 2z-2 + 4z-1 + 5 + 7z + z3, 0<|z|<∞d) 2z2 + 4z + 5 + 7z-1 + z3, 0<|z|<∞


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