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If (1 + x + x^(2))^(n) = sum(r = 0)^(2n)...

If `(1 + x + x^(2))^(n) = sum_(r = 0)^(2n) a_(r) x^(r)`, then `a_(1) - 2a_(2) + 3a_(3) - ... + (-1)^(2n-1)2n.a_(2n) = ...`

A

0

B

1

C

n

D

`-n`

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