2022 AMC 12A Problems/Problem 18
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Problem
Let 
be the transformation of the coordinate plane that first rotates the plane 
degrees counter-clockwise around the origin and then reflects the plane across the 
-axis. What is the least positive
integer 
such that performing the sequence of transformations 
returns the point 
back to itself?
Solution
(Professor Chen Education Palace, www.professorchenedu.com)
