find and compare data in columns

[tango]

I need to find two cells that contains text from three columns... Based on the attached sample, I would like to know the formula on how to find and compare data please. Thank you for your help.

 

[Marc L]

Use the function COUNTIF for example …​

 

[p45cal]

In D2:
=IF(COUNTA(A2:C2)=1,"ok","CHECK")
copy down.