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If P be the sum of odd terms and Q be th...

If P be the sum of odd terms and Q be the sum of even terms in the expansion of `(x+a)^(n)`, then `(x+a)^(2n)+(x-a)^(2n)` is
(i) `P^(2)-Q^(2)`
(ii) `P^(2)+Q^(2)`
(iii) `2(P^(2)+Q^(2))`
(iv) `4PQ`

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