Microsoft Excel 2021365 - Beginner to Advanced - Custom Data Validation

The video tutorial covers creating a custom data validation rule in Excel for invoice numbers. It explains how to construct a formula that checks if the input meets specific conditions: two letters followed by four numbers. The tutorial demonstrates using functions like LEN, LEFT, ISNUMBER, and AND to build the formula, and how to test and apply it in Excel's data validation feature.

Why is it important to see function arguments when constructing a formula?

What is the significance of the VALUE function in the context of the invoice number validation?

What happens if an invalid invoice number is entered into the spreadsheet?

How can you set up custom alert messages for invalid entries in data validation?