User:Isabelchen

AOPS Contributions

AHSME

1. 1995 AHSME Problem 27 Side Note (Number Theory)

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 Side Note (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 4 (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. 2017 AMC10B Problem 17 Solution 4 (Combinatorics)
19. 2017 AMC10B Problem 25 Solution 4 (Number Theory)
20. 2018 AMC10A Problem 10 Solution 8 (Analytic Geometry)
21. 2018 AMC10A Problem 22 Solution 6 (Number Theory)
22. 2018 AMC10B Problem 18 Solution 6 (Combinatorics)
23. 2018 AMC10B Problem 24 Solution 4 (Geometry)
24. 2018 AMC10B Problem 25 Solution 6 (Algebra)
25. 2019 AMC10A Problem 22 Solution 3 (Probability)
26. 2019 AMC10A Problem 24 Solution 2 (Algebra)
27. 2019 AMC10B Problem 22 Solution 4 (Probability, Markov Chain)
28. 2019 AMC10B Problem 25 Solution 6 (Combinatorics)
29. 2020 AMC10A Problem 20 Solution 8 (Geometry)
30. 2020 AMC10A Problem 24 Solution 9 (Number Theory)
31. 2020 AMC10A Problem 24 Solution 10 (Number Theory)
32. 2020 AMC10A Problem 24 Solution 11 (Number Theory)
33. 2020 AMC10B Problem 13 Solution 3 (Combinatorics)
34. 2020 AMC10B Problem 21 Solution 6 (Geometry)
35. 2020 AMC10B Problem 23 Solution 7 (Group Theory)
36. 2020 AMC10B Problem 24 Solution 8 (Algebra)
37. 2020 AMC10B Problem 25 Solution 7 (Combinatorics)
38. 2021 Spring AMC10A Problem 23 Solution 8 (Probability, Markov Chain)
39. 2021 Spring AMC10A Problem 24 Solution 3 (Analytic Geometry)
40. 2021 Spring AMC10A Problem 25 Solution 4 (Combinatorics)
41. 2021 Spring AMC10B Problem 25 Solution 5 (Analytic Geometry)
42. 2021 Fall AMC10A Problem 24 Solution 4 (Graph Theory)
43. 2021 Fall AMC10B Problem 12 Solution 1 (Algebra)
44. 2021 Fall AMC10B Problem 20 Side Note (Probability)
45. 2021 Fall AMC10B Problem 23 Solution 2 (Graph Theory)
46. 2021 Fall AMC10B Problem 24 Solution 1 (Graph Theory)

AMC 12

1. 2010 AMC12A Problem 23 Side Note (Number Theory)
2. 2016 AMC12A Problem 21 Solution 12 (Trigonometry)
3. 2016 AMC12A Problem 21 Side Note (Geometry)
4. 2019 AMC12B Problem 20 Solution 7 (Trigonometry, Angle difference and half angle)

AIME

1. 1983 AIME Problem 4 Solution 5 (Trigonometry, Angle Difference and Law of Cosine)