Originally Posted by arnelgp simplifying your original formula: =IF(COUNTIFS(B:B, B2,C:C,C2)>1,IF(COUNTIFS(B:B,B2,C:C,C2)>1,IF(COUNTIFS($B$2:B2, B2, $C$2:C2,C2)=1,1,0),""), 1) becomes: =IF(COUNTIFS($B2:$B$106, B2,$C2:$C$106,C2)>1,0,1) That works even sexier
=IF(COUNTIFS(B:B, B2,C:C,C2)>1,IF(COUNTIFS(B:B,B2,C:C,C2)>1,IF(COUNTIFS($B$2:B2, B2, $C$2:C2,C2)=1,1,0),""), 1)
=IF(COUNTIFS($B2:$B$106, B2,$C2:$C$106,C2)>1,0,1)
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