1.

Determine the impulse response for the cascade of two LTI systems having impulse responses h1(n)=(1/2)2 u(n) and h2(n)= (1/4)2 u(n).

A. (1/2)<sup>n</sup>[2-(1/2)<sup>n</sup>], n<0
B. (1/2)<sup>n</sup>[2-(1/2)<sup>n</sup>], n>0
C. (1/2)<sup>n</sup>[2+(1/2)<sup>n</sup>], n<0
D. (1/2)<sup>n</sup>[2+(1/2)<sup>n</sup>], n>0
Answer» C. (1/2)<sup>n</sup>[2+(1/2)<sup>n</sup>], n<0


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