I have connected graph has 13 edges, 2 vertex of degree 2, 2 vertex of degree 3, 1 vertex of degree 6, and all others of degree 5. But with an unknown vertices.
I read an online article and it says that for it to be a graph, the total number of edges should be even, and e = 2v? But in this case, 13 edges cannot be formed into a graph? which means that there are 5 vertices?