Question

I NEED HELP PLEASE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Using Euler’s Formula (F + V = E + 2), find the number of edges.

Faces: 25
Vertices: 17
Edges: ?

Answer 1

25  + 17 = E + 2 
42 = E + 2 
42 - 2 = E 
E = 40