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colored prism 6x5x5 into 150 cubes 1x1x1

Source: XII May Olympiad (Olimpiada de Mayo) 2006 L1 P4

September 22, 2022
3D geometrycombinatoricsColoring

Problem Statement

With 150150 white cubes of 1×1×11 \times 1 \times 1 a prism of 6×5×56 \times 5 \times 5 is assembled, its six faces are painted blue and then the prism is disassembled. Lucrecia must build a new prism, without holes, exclusively using cubes that have at least one blue face and so that the faces of Lucrecia's prism are all completely blue. Give the dimensions of the prism with the largest volume that Lucrecia can assemble.