Question

If the region of convergence of x1(n) + x2(n) is 1/3 < |z| < 2/3, then the region of convergence of x1[n] - x2[n] includes

a.

A

b.

B

c.

C

d.

D

Answer: (d).D

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Q. If the region of convergence of x1(n) + x2(n) is 1/3 < |z| < 2/3, then the region of convergence of x1[n] - x2[n] includes

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