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The coeff. of the middle term in the exp...

The coeff. of the middle term in the expansion of `(1 + x)^(40)` is

A

`(1.3.5....39)/(20!).2^(20)`

B

`(1.3.5....39)/(20!)`

C

`(40!)/((20!)^(2))`

D

`40! 2^(20)`

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