and the other vertices of degree 3.

How many vertices does an undirected edge have?
An undirected edge has two vertices u ≠ v called its endpoints. Such an edge can be represented by the two element set { u, v }. The notation ⟨ u → v ⟩ denotes this edge. Both ⟨ u → v ⟩ and ⟨ v → u ⟩ define the same undirected edge, whose endpoints are u and v. Figure 11.1 An example of a graph with 9 nodes and 8 edges.
What is the difference between indegree and outdegree of vertex v?
Indegree of vertex V is the number of edges which are coming into the vertex V. Notation − deg − (V). Outdegree of vertex V is the number of edges which are going out from the vertex V. Notation − deg + (V). Consider the following examples. Take a look at the following directed graph.
How do you find the degree of a vertex?
Equivalently, the degree of a vertex is the number of vertices adjacent to it. For example, for the graph H of Figure 11.1, vertex a is adjacent to vertex b, and b is adjacent to d. The edge ⟨ a → c ⟩ is incident to its endpoints a and c. Vertex h has degree 1, d has degree 2, and deg ( e) = 3.
How many vertices are adjacent in a simple graph?
Two vertices in a simple graph are said to be adjacent iff they are the endpoints of the same edge, and an edge is said to be incident to each of its endpoints. The number of edges incident to a vertex v is called the degree of the vertex and is denoted by deg ( v). Equivalently, the degree of a vertex is the number of vertices adjacent to it.

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