Comentarii Jbmo 2015 Link

. 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. Comentarii JBMO 2015

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

. 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. Comentarii JBMO 2015

Participants had to find prime numbers and an integer satisfying the equation

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