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Q.The coefficient of xnx^{n} in the expansion of (1−x)−k(1 - x)^{-k} is

a
(n+k−1n)\binom{n+k-1}{n}
b
(n+k−1k−1)\binom{n+k-1}{k-1}
c
(−1)n(n+k−1n)(-1)^n \binom{n+k-1}{n}
d
both (a) and (b)

Correct Answer: Option D

The correct solution involves applying the fundamental concept to derive the final value step by step...

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The coefficient of x^{n} in the expansion of (1 - x)^{-k}... | ParikshaNiti