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

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

A

a)0

B

b)1

C

c) `n `

D

d) `-n `

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The correct Answer is:
D
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