Find coefficient of x 2n and x 2n-1 in expansion of (1+x+x 2 ) n .

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Find coefficient of x 2n and x 2n-1 in expansion of (1+x+x 2 ) n .

Find coefficient of x²ⁿand x^2n-1in expansion of (1+x+x²)ⁿ.

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Find coefficient of x 2n and x 2n-1 in expansion of (1+x+x 2 ) n .

Find coefficient of x2n and x2n-1 in expansion of (1+x+x2)n.

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Find coefficient of x²ⁿand x^2n-1in expansion of (1+x+x²)ⁿ.