Art of Problem Solving
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2015 AMC 10A Problems/Problem 21: Revision history

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12 September 2025

4 August 2025

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18 June 2024

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16 August 2023

16 November 2022

28 December 2021

4 October 2021

3 October 2021

25 May 2021

26 January 2021

7 November 2020

28 September 2020

4 July 2020

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1 September 2019

25 January 2016

18 May 2015

5 March 2015

7 February 2015

5 February 2015

4 February 2015

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