1
GATE EE 2008
MCQ (Single Correct Answer)
+1
-0.3
Given $$X(z) = {z \over {{{(z - a)}^2}}}$$ with |z| > a, the residue of $$X(z){z^{n - 1}}$$ at z = a for $$n \ge 0$$ will be
A
an - 1
B
an
C
nan
D
nan - 1
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