I am working on a formula- If A3 returns an error #NUM! then use A1 or A2 (whichever one does not have an error message). I am going to use ISERROR but can not figure out how to tell it to use A1 or A2 (whichever cell does not have an error in it).


You'll need something like


This works for Excel 2007 or later. For earlier versions, you'll have to use ISERROR in an IF statement:


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