The Excel NA function returns the Excel #N/A error. This error message has the meaning 'value not available' and is produced when an Excel Formula is unable to find a value that it needs.
The NA function takes no arguments and therefore, the syntax is simply:
Note that you can also get the same result by simply typing #N/A directly into a worksheet cell.
Formula:
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Result:
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For further details on the Excel #N/A error, and other Excel error types, go to the Excel Formula Errors page.
Also, for further information on the Excel NA function, see the Microsoft Office website.