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Let n be a positive integer and (1+x+x^2...

Let `n` be a positive integer and `(1+x+x^2)^n=a_0+a_1x+ . . . . +a_(2n)x^(2n)dot`
Show that `a_(02) -a_(12)+a_(22)+. . . +a _(2n2)=a_n`

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