I need to take column B and C and highlight the duplicates.
I have over 32000 rows in the spreadsheet.
=SUMPRODUCT(--($B1:$B32244=$B1),--($C1:$C32244=$C1))>1
This solution works, but a) I don't know what it does and b) when I try to sort excel goes into Not Responding.
Any ideas how to make...