How many vertices and how many edges are there in the complete bipartite graphs K 4 , 7 , K 7 , 11 , and K m,n , where m, n, ? Z + ? Solution K4,7 : number of vertices: 4+7 = 11 , number of edges: 4*7 = 28 K7,11 : number of vertices: 11+7 = 18 , number of edges: 11*7 = 77 Km,n : number of vertices: m+n , number of edges: m*n .