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If p(x)=(1+x^2+x^4++x)/(1+x+x^2++x^(n-1)...

If `p(x)=(1+x^2+x^4++x)/(1+x+x^2++x^(n-1)^(2n-2)` is a polynomial in `x ,then n` can be a. `5` b. `10` c. `20` d. `17`

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