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The Hardest Problem from the 1986 IMO
![[IMO Series]: 1986 Poland Q1 - Witness the power of quadratic residues](https://i.ytimg.com/vi/5ZO4sjZFZVI/mqdefault.jpg)
[IMO Series]: 1986 Poland Q1 - Witness the power of quadratic residues

2026 IMO Problem 1 – Human-Friendly Explanation 😁

IMO 1972 Problem 1
![An IMO Divisibility Problem [IMO 1964 Problem 1]](https://i.ytimg.com/vi/_3XIyr6Z3dY/mqdefault.jpg)
An IMO Divisibility Problem [IMO 1964 Problem 1]

1986 IMO Shortlist Problem: You WILL BELIEVE the solution!

International Mathematical Olympiad 1986 Q1

Hardest problem in IMO 1986

1998 IMO Problem #1

1988 IMO Problem #1

1999 IMO Problem #1
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Last Updated: August 17, 2026
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