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The coefficient of x^n in the expansion ...

The coefficient of `x^n` in the expansion of `(1+x)^(2n)` and `(1+x)^(2n-1)` are in the ratio.

A

a) 1: 2

B

b) 1 : 3

C

c) 3 : 1

D

d) 2 : 1

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