I am looking for a formula that will say "Duplicate" based on two criteria.
Say column B has text and column C has dates. If the text appears more than
once and the dates are six or more months apart then the sum of column A
results.
Expamle:
A B C
$45 hardware 11/14/07
$50 hardware 12/04/07
$80 lights 10/01/07
$90 lights 7/25/08
Only $90 is valid in furmula resulting as "Duplicate"

Thanks for your help in advance.