Select the graph that is not regular. в O. B D B. B.

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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**Question:**

Select the graph that is not regular.

**Diagrams:**

1. **First Graph:**
   - A square with vertices labeled A, B, C, and D.
   - All vertices are connected, forming a cycle.
   - Additional diagonal connections from A to C and B to D.

2. **Second Graph:**
   - A quadrilateral with vertices labeled A, B, C, and D.
   - All vertices are connected, forming a cycle.
   - Additional diagonal connections from A to D and B to C.

3. **Third Graph:**
   - A quadrilateral with vertices labeled A, B, C, and D.
   - A is connected to B and D; B is connected to C and A; C is connected to D and B; D is connected to A and C.

4. **Fourth Graph:**
   - Consists of two disconnected lines.
   - One line connects A to B.
   - Another line connects D to C. 

**Note:** A regular graph is one where each vertex has the same number of edges. Select the graph where this is not the case.
Transcribed Image Text:**Question:** Select the graph that is not regular. **Diagrams:** 1. **First Graph:** - A square with vertices labeled A, B, C, and D. - All vertices are connected, forming a cycle. - Additional diagonal connections from A to C and B to D. 2. **Second Graph:** - A quadrilateral with vertices labeled A, B, C, and D. - All vertices are connected, forming a cycle. - Additional diagonal connections from A to D and B to C. 3. **Third Graph:** - A quadrilateral with vertices labeled A, B, C, and D. - A is connected to B and D; B is connected to C and A; C is connected to D and B; D is connected to A and C. 4. **Fourth Graph:** - Consists of two disconnected lines. - One line connects A to B. - Another line connects D to C. **Note:** A regular graph is one where each vertex has the same number of edges. Select the graph where this is not the case.
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