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in Mathematics by (71.2k points)

The coefficient of 1/x in expansion of (1+x)n (1 + 1/x)n is ......

(a) 2n Cn

(b) 2n C(n-1)

(c) 1/2

(d) 2n C0

1 Answer

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Best answer

Correct option: (b) 2n C(n-1)

Explanation:

∴ Co-efficient of x-1 in expansion of (1+x)n (1 + 1/x)n = Co-efficient of xn-1 in expansion of (1+x)2n 

= 2n C(n-1)

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