Euler's formula for Vertices, Edges and faces is V-E+F = 2
Replace the letters with the given information and solve for the missing one.
From the problem V ( Vertices) = 11 and F (faces) = 15.
11 - E + 15 = 2
11 + 15 = 26
26 - E = 2
E = 26-2
E = 24
The answer is b. 24
