Summary  
This chapter covers how to combine logical operators (AND, OR) and nest them within conditional statements (e.g., IF) to evaluate multiple criteria and implement compound logical tests.

General domain of usage  
Data validation and decision-making

Using the `AND` and `OR` allows you to perform more **sophisticated logical tests** by combining **multiple conditions**. 

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## Key Points

- Use the `AND` **function** to test if **all** conditions are met like this: `=AND(condition1, condition2,...)`;
- Use the `OR` **function** to test if **at least one** condition is met like this: `=OR(condition1, condition2, ...)`.

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Combining AND & OR in Excel

Key Points