OMO Problems

Spring 2020

OMO Spring 2020 Problems

Clarifications/Updates

#4: The side length of ABCD is 16, not the size length.

#9: The magician never draws an unpaired rabbit.

#12: Convex pentagon ABCDE is inscribed in circle γ.

#22: Triangle ABC is scalene.

#29: The definition of the matrix A has changed. Refer to the version above for the new definition.


Below are problems, solutions, and results for all the past OMO contests. You can also find all the problems (and discussion) on the Art of Problem Solving site.

Fall 2019 Results

OMO Fall 2019 Problems
OMO Fall 2019 Solutions
Results
Statistics
Top Teams

Spring 2019 Results

OMO Spring 2019 Problems
OMO Spring 2019 Solutions
Results
Statistics
Top Teams

Fall 2018 Results

OMO Fall 2018 Problems
OMO Fall 2018 Solutions
Results
Statistics
Top Teams

Spring 2018 Results

OMO Spring 2018 Problems
OMO Spring 2018 Solutions
Results
Statistics
Top Teams

Fall 2017 Results

OMO Fall 2017 Problems
OMO Fall 2017 Solutions
Results
Statistics
Top Teams

Spring 2017 Results

OMO Spring 2017 Problems
OMO Spring 2017 Solutions
Results
Statistics
Top Teams

Fall 2016 Results

OMO Fall 2016 Problems
OMO Fall 2016 Solutions
Results
Statistics
Top Teams

Spring 2016 Results

OMO Spring 2016 Problems
OMO Spring 2016 Solutions
Results
Statistics
Top Teams

Fall 2015 Results

OMO Fall 2015 Problems
OMO Fall 2015 Solutions
Results
Statistics
Top Teams

Spring 2015 Results

OMO Spring 2015 Problems
OMO Spring 2015 Solutions
Results
Statistics
Top Teams

Fall 2014 Results

OMO Fall 2014 Problems
OMO Fall 2014 Solutions
Results
Statistics
Top Teams

Spring 2014

OMO Spring 2014 Problems
OMO Spring 2014 Solutions
Results
Statistics
Top Teams

Fall 2013

Problems
Solutions
Results
Statistics
Top Teams

Winter 2013

Problems
Solutions
Problem Statistics
Results
Top Teams

Fall 2012

Problems
Solutions
Problem Statistics
Results
Top Teams

Winter 2012

Problems
Solutions
Problem Statistics
Results
Top Teams