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[" If "a(r)" is the coefficient of "x^(r...

[" If "a_(r)" is the coefficient of "x^(r)" ,in the expansion of "(1+x+x^(2))^(n)" ,"],[" then "a_(1)-2a_(2)+3a_(3)-...-2na_(2n)=],[[" (a) "0," (b) "n],[" (c) "-n," (d) "2n]]

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