User:Isabelchen

AOPS Contributions

AHSME

1. 1991 AHSME Problem 30 Solution 2 (Combinatorics)
2. 1994 AHSME Problem 28 Solution 2 (Analytic Geometry)
3. 1994 AHSME Problem 29 Solution 2 (Geometry, Trigonometry)
4. 1995 AHSME Problem 30 Solution 2 (3D Geometry)
5. 1996 AHSME Problem 27 Solution 3 (3D Geometry)
6. 1996 AHSME Problem 30 Solution 4 (Geometry, Trigonometry)

AMC 8

1. 2022 AMC8 Problem 25 Solution 4 (Probability)
2. 2022 AMC8 Problem 25 Remark (Probability)

AMC 10

1. 2013 AMC10A Problem 24 Graph Theory Insight (Graph Theory)
2. 2013 AMC10A Problem 25 Solution 5 (Discrete Geometry)
3. 2013 AMC10B Problem 22 Remark (Number Theory)
4. 2014 AMC10A Problem 18 Solution 2 (Analytic Geometry)
5. 2014 AMC10A Problem 18 Solution 3 (Analytic Geometry)
6. 2014 AMC10A Problem 22 Solution 6 (Geometry)
7. 2014 AMC10A Problem 22 Solution 7 (Geometry)
8. 2015 AMC10A Problem 21 Solution 3 (3D Geometry)
9. 2015 AMC10A Problem 22 Solution 4 (Combinatorics)
10. 2015 AMC10A Problem 24 Solution 3 (Geometry)
11. 2015 AMC10B Problem 19 Solution 3 (Geometry)
12. 2016 AMC10A Problem 20 Solution 3 (Combinatorics)
13. 2016 AMC10B Problem 19 Solution 4 (Geometry)
14. 2016 AMC10B Problem 19 Solution 5 (Geometry)
15. 2016 AMC10B Problem 22 Solution 4 (Graph Theory)
16. 2016 AMC10B Problem 25 Solution 1 Supplement (Number Theory)
17. 2016 AMC10B Problem 25 Solution 3 (Number Theory)
18. 2016 AMC10B Problem 25 Solution 4 (Number Theory)
19. 2016 AMC10B Problem 25 Remark (Number Theory)
20. 2017 AMC10B Problem 17 Solution 4 (Combinatorics)
21. 2017 AMC10B Problem 25 Solution 4 (Number Theory)
22. 2018 AMC10A Problem 10 Solution 8 (Analytic Geometry)
23. 2018 AMC10A Problem 22 Solution 6 (Number Theory)
24. 2018 AMC10B Problem 18 Solution 6 (Combinatorics)
25. 2018 AMC10B Problem 24 Solution 4 (Geometry)
26. 2018 AMC10B Problem 25 Solution 6 (Algebra)
27. 2019 AMC10A Problem 22 Solution 3 (Probability)
28. 2019 AMC10A Problem 24 Solution 2 (Algebra)
29. 2019 AMC10B Problem 22 Solution 4 (Probability, Markov Chain)
30. 2019 AMC10B Problem 25 Solution 6 (Combinatorics)
31. 2020 AMC10A Problem 20 Solution 7 (Geometry)
32. 2020 AMC10A Problem 24 Solution 9 (Number Theory)
33. 2020 AMC10A Problem 24 Solution 10 (Number Theory)
34. 2020 AMC10A Problem 24 Solution 11 (Number Theory)
35. 2020 AMC10B Problem 13 Solution 3 (Combinatorics)
36. 2020 AMC10B Problem 21 Solution 6 (Geometry)
37. 2020 AMC10B Problem 23 Solution 5 (Group Theory)
38. 2020 AMC10B Problem 24 Solution 8 (Algebra)
39. 2020 AMC10B Problem 25 Solution 7 (Combinatorics)
40. 2021 Spring AMC10A Problem 23 Solution 8 (Probability, Markov Chain)
41. 2021 Spring AMC10A Problem 24 Solution 3 (Analytic Geometry)
42. 2021 Spring AMC10A Problem 25 Solution 4 (Combinatorics)
43. 2021 Spring AMC10B Problem 25 Solution 4 (Analytic Geometry)
44. 2021 Spring AMC10B Problem 25 Solution 5 (Analytic Geometry)
45. 2021 Spring AMC10B Problem 25 Remark (Analytic Geometry)
46. 2021 Fall AMC10A Problem 24 Solution 4 (Graph Theory)
47. 2021 Fall AMC10B Problem 12 Solution 1 (Algebra)
48. 2021 Fall AMC10B Problem 20 Remark (Probability)
49. 2021 Fall AMC10B Problem 23 Solution 2 (Graph Theory)
50. 2021 Fall AMC10B Problem 24 Solution 1 (Graph Theory)

AMC 12

1. 2000 AMC12 Problem 25 Solution 5 (Graph Theory)
2. 2001 AMC12 Problem 22 Solution 5 (Geometry)
3. 2001 AMC12 Problem 24 Solution 5 (Geometry, Trigonometry)
4. 2002 AMC12A Problem 23 Solution 4 (Geometry)
5. 2002 AMC12A Problem 23 Solution 5 (Geometry, Trigonometry)
6. 2003 AMC12A Problem 17 Solution 8 (Geometry)
7. 2003 AMC12B Problem 21 Solution 2 (Analytic Geometry)
8. 2003 AMC12B Problem 25 Solution 3 (Probability)
9. 2007 AMC12B Problem 23 Solution 3 (Geometry)
10. 2009 AMC12B Problem 24 Solution 4 (Trigonometry)
11. 2010 AMC12A Problem 23 Remark (Number Theory)
12. 2010 AMC12B Problem 23 Solution 4 (Algebra)
13. 2011 AMC12B Problem 20 Solution 6 (Geometry, Trigonometry)
14. 2012 AMC12B Problem 17 Solution 6 (Geometry, Trigonometry)
15. 2012 AMC12B Problem 18 Solution 5 (Combinatorics)
16. 2012 AMC12B Problem 19 Solution 3 (3D Geometry)
17. 2012 AMC12B Problem 20 Solution 2 (Geometry)
18. 2012 AMC12B Problem 21 Solution 4 (Geometry, Trigonometry)
19. 2013 AMC12A Problem 16 Solution 4 (Algebra)
20. 2013 AMC12A Problem 18 Solution 3 (3D Geometry)
21. 2013 AMC12B Problem 24 Solution 6 (Geometry)
22. 2013 AMC12B Problem 25 Solution 3 (Algebra)
23. 2014 AMC12A Problem 20 Remark (Geometry)
24. 2014 AMC12A Problem 22 Solution 2 (Number Theory)
25. 2014 AMC12B Problem 21 Solution 6 (Geometry)
26. 2014 AMC12B Problem 22 Remark (Probability, Markov Chain)
27. 2014 AMC12B Problem 24 Solution 4 (Geometry)
28. 2016 AMC12A Problem 20 Solution 5 (Algebra)
29. 2016 AMC12A Problem 21 Remark (Geometry)
30. 2016 AMC12B Problem 15 Solution 4 (Number Theory)

AIME

1. 1983 AIME Problem 4 Solution 6 (Geometry, Trigonometry)
2. 1983 AIME Problem 7 Solution 7 (Combinatorics)
3. 1985 AIME Problem 12 Solution 5 (Probability)
4. 1997 AIME Problem 9 Solution 4 (Algebra)
5. 2001 AIME II Problem 9 Solution 3 (Combinatorics)
6. 2021 AIME I Problem 12 Solution 2 (Probability, Markov Chain)
7. 2021 AIME I Problem 12 Remark (Probability, Markov Chain)
8. 2021 AIME II Problem 8 Solution 2 (Probability, Markov Chain)
9. 2021 AIME II Problem 8 Remark (Probability, Markov Chain)
10. 2022 AIME I Problem 8 Solution 2 (Geometry)
11. 2022 AIME II Problem 2 Solution (Probability)
12. 2022 AIME II Problem 5 Solution 1 (Number Theory)
13. 2022 AIME II Problem 6 Solution 1 (Algebra)
14. 2022 AIME II Problem 7 Solution 1 (Geometry)
15. 2022 AIME II Problem 8 Solution 2 Supplement (Number Theory)
16. 2022 AIME II Problem 8 Solution 3 Supplement (Number Theory)
17. 2022 AIME II Problem 14 Solution (Algebra)