Problem

Source: 2023 Argentina L2 P5

Tags: algebra, combinatorics



A rectangular parallelepiped painted blue is cut into $1 \times 1\times 1$ cubes. Find the possible dimensions if the number of cubes without blue faces is equal to one-third of the total number of cubes. Note: A rectangular parallelepiped is a solid with $6$ faces, all of which are rectangles (or squares).