Art of Problem Solving

2012 AMC 10B Problems/Problem 21: Revision history

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23 October 2021

15 May 2021

5 September 2020

4 April 2020

9 October 2019

20 August 2019

6 August 2019

12 February 2017

13 August 2014

8 February 2014

4 July 2013

20 March 2013

17 February 2013

15 January 2013

14 March 2012

12 March 2012