Art of Problem Solving
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1985 AIME Problems/Problem 4: Revision history

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2 March 2020

12 January 2018

8 March 2015

16 May 2014

9 March 2014

20 September 2011

22 April 2011

6 June 2010

1 September 2008

6 May 2007

21 January 2007

19 January 2007

18 November 2006

9 July 2006