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If a be sum of the odd numbered terms a...

If a be sum of the odd numbered terms and b the sum of even numbered terms of the expansion `(1+x)^(n)`,`n` `epsilon` `N` `then` `(1-x^(2))^(n)` is equal to

A

`a^(2)-b^(2)`

B

`a^(2)+b^(2)`

C

`b^(2)-a^(2)`

D

`a+b`

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