If
a = Number of vertices of a tetrahedron
b = Number of edges of a tetrahedron
c = Number of faces of a tetrahedron
then the value of a + b + c =

The correct option is B 14
A tetrahedron is formed with the help of four planes as you can see in the figures .

A tetrahedron is composed of four triangular faces, six straight edges and four vertex corners
$\Rightarrow$ a + b + c = 4 + 6 + 4 = 14