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Found problems: 1

2021 AMC 12/AHSME Spring, 20
Tags: AMC 12 , misplaced
Let $Q(z)$ and $R(z)$ be the unique polynomials such that $$z^{2021}+1=(z^2+z+1)Q(z)+R(z)$$ and the degree of $R$ is less than $2.$ What is $R(z)?$ $\textbf{(A) }-z \qquad \textbf{(B) }-1 \qquad \textbf{(C) }2021\qquad \textbf{(D) }z+1 \qquad \textbf{(E) }2z+1$