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

[(1+x+x^(2))^(n)=sum_(r=0)^(2n)a_(r)x^(r)],[a_(1)-2a_(2)+3a_(3)-....-2n.a_(2n)=....],[0],[1],[n],[-n]" then "

[(1+x+x^(2))^(n)=sum(r=0)^(2n)a(r)x^(r)],[a(1)-2a(2)+3a(3)-....-2n.a(2...
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If a(r) is the coefficient of x^(r) in the expansion of (1+x+x^(2))^(n...
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If (1+x+x^(2))^(n)=sum(r=0)^(2n)a(r)x^(r), then a(1)-2a(2)+3a(3)-...-2...
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sum(i=0i0)^(2n)a(r)(x-1)^(r)=sum(r=0)^(2n)b(r)(x-2)^(r) and b(r)=(-1)^...
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(1+x)(sum(r=0)^(n)nC(r)x^(r))+(1+x^(2))(sum(r=0)^(n-1)(n-1)C(r)x^(r))+...
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Let (1+x+x^(2))^(n)=sum(r=0)^(2n)a(r)*x^(r), where n is a positive int...
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If (1+x+x^(2))^(n)=sum(r=0)^(2n)a(r)x^(r), then prove that a(r)=a(2n-r...
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Consider (1 + x + x^(2))^(n) = sum(r=0)^(n) a(r) x^(r) , where a(0),...
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Consider (1 + x + x^(2))^(n) = sum(r=0)^(n) a(r) x^(r) , where a(0),...
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