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If (1 + x + x^2)^n = C0 + C1x + C2x^2 + ...

If `(1 + x + x^2)^n = C_0 + C_1x + C_2x^2 + C_3x^3 + ……..C_nx^n` then find `C_0 + C_3 + C_6 + ……. `

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The correct Answer is:
`3^(n-1)`
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