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- 2018 AIME II Problems/Problem 9
- User:Nhacai18winnews
- User:Yiyj1
- 1993 AIME Problems/Problem 13
- User:Bakedpotato66
- 2024 AMC 10A Problems/Problem 1
- 2023 AMC 12A Problems/Problem 21
- 2005 IMO Problems/Problem 6
- User talk:Zhenghua
- Let a and b be nonzero real numbers such that (2 - 7i)(a + bi)is pure imaginary. Find a/b.
- 2002 AMC 12B Problems/Problem 17