if F is the number of faces, E is the number of edges and V is the number of vertices, calculate V - E + F for a hexagonal prism.
A hexagonal prism has 8 faces (6 rectangular faces and 2 hexagonal faces), 18 edges (6 pairs of parallel edges on the rectangular faces plus 6 edges connecting the two hexagonal faces) and 12 vertices (6 on each of the hexagonal faces).
Therefore, V - E + F for a hexagonal prism is:
12 - 18 + 8 = 2.
So, V - E + F for a hexagonal prism is 2.