I have a polyhedron with the properties that every vertex is at the junction of exactly three faces, two of its faces are heptagons, and all its other faces are pentagonal.
How many pentagonal faces are there?
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I have a polyhedron with the properties that every vertex is at the junction of exactly three faces, two of its faces are heptagons, and all its other faces are pentagonal.
How many pentagonal faces are there?