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If (1+x+x^2)^n=a0+a1x+a2x^2++a(2n)x^(2n)...

If `(1+x+x^2)^n=a_0+a_1x+a_2x^2++a_(2n)x^(2n),` find the value of `a_0+a_3+a_6++ ,n in Ndot`

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