A pair set, also known as an **ordered pair**, contains exactly **two elements**. 

### Example:
If you have a pair set \( (a, b) \), it has exactly two elements: \( a \) and \( b \).

**Key Points:**
- **Order matters** in an ordered pair, meaning \( (a, b) \) is different from \( (b, a) \) unless \( a = b \).
- The concept of a pair set is often used in coordinate geometry, where each pair represents a point in a 2-dimensional space.

### Final Answer:
The number of elements in a pair set is \(\boxed{2}\).

Would you like more details on pair sets or have any other questions? Here are some related questions that might interest you:

1. What is the difference between an ordered pair and an unordered set?
2. How do ordered pairs relate to Cartesian coordinates in geometry?
3. What are the properties of ordered pairs in set theory?
4. How can ordered pairs be used to define relations and functions?
5. What is the general form of an ordered pair in higher-dimensional spaces?

**Tip:** When working with pair sets or ordered pairs, always pay attention to the order of the elements, as it can change the meaning entirely.

Discover what a pair set is and how it functions with two elements in an ordered manner. Explore examples and applications in coordinate geometry. Ideal for anyone seeking clarity on the basics of pair sets.

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