Draw an undirected graph, if possible (if not possible explain why not that has a. Five vertices and three edges and is connected. b. Five vertices, three edges, and two connected components. c. Five vertices, two edges, and three connected components.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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**Task: Draw an undirected graph, if possible (if not possible, explain why not), that meets the following criteria:**

a. Five vertices, three edges, and is connected.

b. Five vertices, three edges, and two connected components.

c. Five vertices, two edges, and three connected components.

d. Five vertices, two edges, and two connected components.

e. Five vertices, six edges, and two connected components.

---

**Explanations:**

a. **Graph is possible**: A connected graph with five vertices and three edges can be made by having, for example, a path between four of the vertices, with the fifth vertex connected to any one of them.

b. **Graph is possible**: This graph can be made by creating a triangle with three edges (one component) and leaving two vertices isolated, or connecting them via a single edge (second component).

c. **Graph is not possible**: With only two edges, you cannot create three separate connected components. Each edge creates a connection between two vertices, so having three components would require at least three edges.

d. **Graph is possible**: A simple example would be to connect two pairs of vertices with one edge each, leaving the fifth vertex isolated.

e. **Graph is not possible**: With five vertices and six edges, the graph must form a complete graph where all vertices are connected (which is a single component), violating the condition of having two connected components.
Transcribed Image Text:**Task: Draw an undirected graph, if possible (if not possible, explain why not), that meets the following criteria:** a. Five vertices, three edges, and is connected. b. Five vertices, three edges, and two connected components. c. Five vertices, two edges, and three connected components. d. Five vertices, two edges, and two connected components. e. Five vertices, six edges, and two connected components. --- **Explanations:** a. **Graph is possible**: A connected graph with five vertices and three edges can be made by having, for example, a path between four of the vertices, with the fifth vertex connected to any one of them. b. **Graph is possible**: This graph can be made by creating a triangle with three edges (one component) and leaving two vertices isolated, or connecting them via a single edge (second component). c. **Graph is not possible**: With only two edges, you cannot create three separate connected components. Each edge creates a connection between two vertices, so having three components would require at least three edges. d. **Graph is possible**: A simple example would be to connect two pairs of vertices with one edge each, leaving the fifth vertex isolated. e. **Graph is not possible**: With five vertices and six edges, the graph must form a complete graph where all vertices are connected (which is a single component), violating the condition of having two connected components.
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