Can a polyhedron have for its faces

(i) 3 triangles?

(ii) 4 triangles?

(iii) A square and four triangles?

(i) No, such a polyhedron is not possible. A polyhedron has minimum 4 faces

(ii) Yes, a triangular pyramid has 4 triangular faces

(iii) Yes, a square pyramid has a square face and 4 triangular faces