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If (1 - x + x^2)^n = a0 + a1x + a2x^2 +....

If `(1 - x + x^2)^n = a_0 + a_1x + a_2x^2 +...+ a_(2n) x^(2n)` then `a_0 + a_2 + a_4 +...+ a_(2n)` is equal to

A

a) `3n^2 + 1/2`

B

b) `(3^n - 1) / 2`

C

c) `(3^n + 1) / 2`

D

d) `(3^2 -1) / 2`

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