How can I compare 2 sets of Social Security #'s and Identify dupes

I'm sure this can't be that difficult but for some reason it's just not
working for me. I have 2 lists of social security numbers that I need to
compare and pull out duplicates. Any help would be greatly appreciated.
Thank You.

Use a formula of

=IF(COUNTIF(A:A,B1)<>0,"Duplicate","")

in C1, and copy down

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HTH

RP
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"vwwolfe" <[email protected]> wrote in message
news:[email protected]...
> I'm sure this can't be that difficult but for some reason it's just not
> working for me. I have 2 lists of social security numbers that I need to
> compare and pull out duplicates. Any help would be greatly appreciated.
> Thank You.