Comentarii Jbmo 2015 May 2026

. Notes indicate that many participants were able to solve this using analytical or vector methods.

The competition consisted of four problems covering algebra, number theory, geometry, and combinatorics.

A game-theory problem on a board involving L-shapes. It required determining the minimum number of marked squares needed to ensure a certain outcome. Key Commentary Insights Comentarii JBMO 2015

This problem involved minimizing a specific expression given the constraint

. Commentary suggests this was a very accessible problem, possibly even at a 5th or 6th-grade level, which resulted in a high number of maximum scores. A game-theory problem on a board involving L-shapes

Problem 3 (Geometry) was noted for its "attackability" through multiple different methods, including classic Euclidean geometry, vectors, and coordinate geometry.

for positive real numbers. The minimum value was found to be 3. Commentary suggests this was a very accessible problem,

A significant majority (24 out of 28) of gold and silver medalists achieved a perfect score on Problem 1, confirming its low difficulty.