Art of Problem Solving
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2021 AMC 10B Problems/Problem 21: Revision history

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22 September 2025

9 November 2024

24 October 2024

3 March 2024

20 May 2023

8 November 2022

25 August 2022

8 August 2022

11 October 2021

25 August 2021

20 April 2021

2 March 2021

24 February 2021

18 February 2021

13 February 2021

12 February 2021

11 February 2021

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