Art of Problem Solving
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2011 AMC 8 Problems/Problem 20: Revision history

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15 July 2024

17 December 2023

13 May 2023

15 April 2023

16 January 2023

8 October 2022

7 October 2021

5 July 2013

4 November 2012

2 December 2011

25 November 2011