The graph with its complement forms a complete graph, a graph with 28 edges. Now, solve the following combination: if Combin(n,2)=28 then n=?
hello please help me understand this question...thanxThe complement graph ¯G of a simple graph G has the same vertices as G, and two vertices are adjacent in ¯G if and only if they are not adjacent in G.If G is a simple graph with 15 edges and ¯G has 13 edges, how many vertices does G have?