MathDB
filling with cubes a 4x2x2 crate

Source: Portugal OPM 2023 p3

May 15, 2024
combinatoricscombinatorial geometrygeometry3D geometry

Problem Statement

A crate with a base of 4×24 \times 2 and a height of 22 is open at the top. Tomas wants to completely fill the crate with some of his cubes. It has 1616 equal cubes of volume 11 and two equal cubes of volume 88. A cube of volume 11 can only be placed on the top layer if the cube on the bottom layer has already been placed. In how many ways can Tom'as fill the box with cubes, placing them one by one?