If X(z) = z eith |z| > a,(z - a)²then residue of

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If X(z) = z eith |z| > a,
(z - a)²

then residue of X(z)z^{n – 1} at z = a for n ≥ 0 will be

1. a^{n – 1}
2. aⁿ
3. naⁿ
4. na^{n – 1}

Correct Option: D

X(z) =	z	with \|z\| > a
	(z - a)²

Let f(z) = X(z) z^{n – 1} =	zⁿ	with \|z\| > a
	(z - a)²