# If 〖(1+x+x^2)〗^n = a_0+a_2 x^2+ ------ +a_2n x^2n then prove that a_0+a_3+a_6+ ----- = 3^(n-1).

**Tutor description**

If 〖(1+x+x^2)〗^n = a_0+a_2 x^2+ ------ +a_2n x^2n then prove that a_0+a_3+a_6+ ----- = 3^(n-1).

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