NOT function
This article describes the formula syntax and usage of the NOTfunction in Microsoft Excel.
Description
Reverses the value of its argument. Use NOT when you want to make sure a value is not equal to one particular value.
Syntax
NOT(logical)
The NOT function syntax has the following arguments:

Logical Required. A value or expression that can be evaluated to TRUE or FALSE.
Remark
If logical is FALSE, NOT returns TRUE; if logical is TRUE, NOT returns FALSE.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?

Select the example in this article.
Important Do not select the row or column headers.
Selecting an example from Help

Press CTRL+C.

In Excel, create a blank workbook or worksheet.

In the worksheet, select cell A1, and press CTRL+V.
Important For the example to work properly, you must paste it into cell A1 of the worksheet.

To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

