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ISBLANK :
This function will determine if there is an entry in a particular cell.
It can be used when a spreadsheet has blank cells which may cause errors, but which will be filled later as the data is received by the user.
Syntax-: =ISBLANK(CellToTest)

ISERROR:
This function tests a cell or calculation to determine whether an error has been generated.
It will show TRUE for any type of error and FALSE if no error is found.
Syntax-: =ISERROR(CellToTest)
The CellToTest can be a cell reference or a formula.

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