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AMC 12 2022a Problem 18

  • Paper

Let TkT_k be the transformation of the coordinate plane that first rotates the plane kk degrees counterclockwise around the origin and then reflects the plane across the yy-axis. What is the least positive integer nn such that performing the sequence of transformations T1,T2,T3,…,TnT_1, T_2, T_3, \dots, T_n returns the point (1,0)(1,0) back to itself?

(A) 359(B) 360(C) 719(D) 720(E) 721\textbf{(A) } 359 \textbf{(B) } 360 \textbf{(C) } 719 \textbf{(D) } 720 \textbf{(E) } 721

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

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A

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