If a and b are the coefficients of x^n a...

If a and b are the coefficients of `x^n` and `x^(n+1)` reapectively in the expansion of `(1+x)^(2n+1)`, then

A

a) a = 2b

B

b) b = 2a

C

c) a = b

D

d) a + b = (2n + 1)!

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