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Coefficient of the term independent of x in the expan-sion of $(1 + x)^{2 n} {(\frac{x}{1 - x})}^{- 2 n}$ is :

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2nCn

(−1)n2nCn

n2−nCn

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Correct option is B

Coefficient of the term independent of x in the expan-sion of(1+x)2nx1−x−2nor (1+x)2n(1-x)2nx2n = coefficient of x2n in 1−x22n= coefficient of tn in (1−t)2n=2nCn(−1)n

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Coefficient of the term independent of x in the expan-sion of (1+x)2nx1−x−2n is :

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Coefficient of the term independent of x in the expan-sion of $(1 + x)^{2 n} {(\frac{x}{1 - x})}^{- 2 n}$ is :