Elementary solution of IMO 2009 P1, no advanced knowledge needed
![](https://i.ytimg.com/vi/Nk7c4m_yBTc/mqdefault.jpg)
8:41
Find the fake among 8 coins with minimum number of weighings (Interview intelligence question)
![](https://i.ytimg.com/vi/WBHyr0j33_I/mqdefault.jpg)
27:59
El problema más troll de la historia de la Olimpiada Internacional de Matemáticas
![](https://i.ytimg.com/vi/O1yEdlVcUIg/mqdefault.jpg)
13:51
What the 1869 MIT Entrance Exam Reveals About Math Today
![](https://i.ytimg.com/vi/V416Gob-EEY/mqdefault.jpg)
8:36
Can you find a strategy to save these mathematicians lives in a coin flip game?
![](https://i.ytimg.com/vi/uCZU9vG3HlM/mqdefault.jpg)
9:09
Can you solve this number theory problem from Argentina math olympiad?
![](https://i.ytimg.com/vi/52ATMZ-GqcY/mqdefault.jpg)
14:24
EXAMEN MATEMÁTICAS RUSO "Ogué". Estudiantes 16 años.
![](https://i.ytimg.com/vi/RcyLMzK4zks/mqdefault.jpg)
5:56
Simple paradox in math olympiad question for middle school
![](https://i.ytimg.com/vi/Z3XMzBS3r2Y/mqdefault.jpg)
6:11