1.

If(1+x+x^(2))^(n)=sum_(r=0)^(2n)a_(4)x^(r ), thena_(r )-""^(n)C_(1)*a_(r-1)+""^(n)C_(2)a_(r-2)- ""^(n)C_(2)a_(r-3)+………+(-1)^(r ) ""^(n)C_(r)a_(0)is equal to : (r is not multiple of 3)

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0
`""^(N)C_(R)`
`a_(r)`
1

Answer :A


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