# If x, y and z represent the number of faces,

If x, y and z represent the number of faces, number of vertices and number of edges respectively of a polyhedral, then which of the following is true?

(a) x + 2 = z – y

(b) x – 2 = x – y

(c) y – 2 = z + x

(d) x – 2 = z – y