1. The problem statement, all variables and given/known data What is the number of edges of a convex polytope with n vertices all of whose faces are triangles. 2. Relevant equations # of faces + #of vertecies = # of edges + 2 3. The attempt at a solution My reasoning is as follows: n/3 + n = # of edges + 2 4n/3 - 2 = #of edges This doesn't seem right though. Am I using the correct formula?