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Excel Duplicate Search

I have a spread sheet with 14k entries containing first name, last name, city, and email address.  I want to flag duplicates.  My thought was to place an "x" in column E next to all duplicate entries.  I am having trouble with the formula.  Any help would be much appreciaed.
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Bob Schneider
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Bob Schneider
1 Solution
 
Rgonzo1971Commented:
Hi,

you could use

=IF(COUNTIFS(A:A,A1,B:B,B1,C:C,C1,D:D,D1)>1,"X","")

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Regards
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Bob SchneiderCo-OwnerAuthor Commented:
Thank you
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