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If in the expansion of (a+x)^(n),P and Q...

If in the expansion of `(a+x)^(n),P and Q` represent the sum of odd and even terms respectively, then `P^(2)-Q^(2)` equals

A

`(a^(2)-x^(2))^(n) `

B

`(a^(2)-x^(2))^(2 n) `

C

`(a^(2)+x^(2))^(2 n) `

D

`(a^(2)+x^(2))^(n) `

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The correct Answer is:
A
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