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The coefficients of the middle term in t...

The coefficients 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 !) `

D

` `40 ! 2^(20)

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The correct Answer is:
A
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