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AMC 12 2020b Problem 17

  • Paper

How many polynomials of the form x5+ax4+bx3+cx2+dx+2020x^5 + ax^4 + bx^3 + cx^2 + dx + 2020, where aa, bb, cc, and dd are real numbers, have the property that whenever rr is a root, so is −1+i32⋅r\frac{-1+i\sqrt{3}}{2} \cdot r? (Note that i=−1i=\sqrt{-1})

(A) 0(B) 1(C) 2(D) 3(E) 4\textbf{(A) } 0 \textbf{(B) }1 \textbf{(C) } 2 \textbf{(D) } 3 \textbf{(E) } 4

Dataset text AMC 12 2000 to 2025. Quoted with source.

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C

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