Art of Problem Solving
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2018 AMC 8 Problems/Problem 21: Revision history

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19 January 2021

18 January 2021

16 January 2021

3 November 2020

1 November 2020

27 October 2020

16 October 2020

14 June 2020

6 May 2020

23 April 2020

12 April 2020

9 February 2020

2 January 2020

13 October 2019

15 July 2019

21 November 2018

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