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AMC 10 2021a Problem 15

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Values for A,B,C,A,B,C, and DD are to be selected from {1,2,3,4,5,6}\{1, 2, 3, 4, 5, 6\} without replacement (i.e. no two letters have the same value). How many ways are there to make such choices so that the two curves y=Ax2+By=Ax^2+B and y=Cx2+Dy=Cx^2+D intersect? (The order in which the curves are listed does not matter; for example, the choices A=3,B=2,C=4,D=1A=3, B=2, C=4, D=1 is considered the same as the choices A=4,B=1,C=3,D=2.A=4, B=1, C=3, D=2.) (A) 30(B) 60(C) 90(D) 180(E) 360\textbf{(A) }30 \textbf{(B) }60 \textbf{(C) }90 \textbf{(D) }180 \textbf{(E) }360

Dataset text NuminaMath-1.5. Quoted with source.

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90

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