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[f(1+x+x^(2))^(p)=a(0)+a(1)x+a(2)x^(2)+....

[f(1+x+x^(2))^(p)=a_(0)+a_(1)x+a_(2)x^(2)+...+a_(2n)x^(2n)," then "a_(0)+a_(3)+a_(6)+a_(9)+..." is equal to "],[[" a) "3^(n)," (b) "3^(n-1)," (c) "3^(n+1)]]

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