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If (1-x+x^(2n))^n=a0+a1x+a2^2+.+a(2n)x^(...

If `(1-x+x^(2n))^n=a_0+a_1x+a_2^2+.+a_(2n)x^(2n) then a_0+a_2+a_4+…..+a_(2n)` equals (A) `(3^n+1)/2` (B) `3^n-1)/2` (C) `1-3^n`/2` (D) `3^n+ 1/2`

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