If F = n and E = n-1 then what will be the value of V if we use Euler's formula?

Euler's formula for polyhedrons gives the relation between the number of faces, edges and vertices in a solid. It is given as:

F - E + V = 2

Where F - faces, E - edges, and V - vertices.

Given: F = n and E = n-1

$\Rightarrow$n - (n-1) + V = 2

$\Rightarrow$n - n + 1 + V = 2

$\Rightarrow$V = 2 - 1 = 1

Therefore, the number of vertices must be 1.