When you use the vlookup function and the lookup value is not included in the lookup cell range, what will be the formula result

Answer 1

In Google Sheets it's an error #N/A: Did not find value in VLOOKUP evaluation. If you want it to be something else, you can wrap your VLOOKUP in IFERROR like this:

=IFERROR(VLOOKUP('what_to_find', A1:C, 3, False), "Not found.")