Th set of girls in a boys school is :

Options

A. a null set
B. a singleton
C. a finite set
D. infinite set .

Answer

To solve the question regarding the set of girls in a boys' school, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**:
- The question asks about the set of girls in a boys' school. By definition, a boys' school is an educational institution that only admits boys.

**Hint**: Think about the definition of a boys' school and what it implies about the students enrolled.

2. **Identify the Set**:
- Since a boys' school does not have any girls enrolled, we need to determine what this means for the set of girls.

**Hint**: Consider what it means to have no elements in a set.

3. **Determine the Type of Set**:
- The set of girls in a boys' school is empty because there are no girls present. In set theory, an empty set is denoted by the symbol ∅ or can be referred to as a null set.

**Hint**: Recall the definition of a null set and how it is represented.

4. **Evaluate the Options**:
- The options given are:
- Null set
- Singleton set
- Finite set
- Infinite set
- Since we have established that the set of girls is empty, the correct answer is the null set.

**Hint**: Review the definitions of singleton, finite, and infinite sets to confirm why they do not apply in this scenario.

5. **Conclusion**:
- Therefore, the set of girls in a boys' school is a null set.

**Hint**: Summarize your findings to reinforce the conclusion.

### Final Answer:
The set of girls in a boys' school is a **null set** (∅).