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    OlympiadHardCombinatorics7–9

    An ant walks along the edges of a cube from one vertex to the opposite vertex, never making a detour. How many different shortest routes are there?

    Uma formiga caminha ao longo das arestas de um cubo, de um vértice até ao vértice oposto, sem nunca dar uma volta a mais. Quantos caminhos mais curtos diferentes existem?

    Answer options

    Solution

    Step 1 of 3

    1. 1.The opposite vertex differs in all three coordinates, so a shortest route uses exactly three edges, one in each direction.