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Excel help to identify duplicate values with a funciton or conditional format

Hello to all excel gurus,
I am trying to write a formula that will check 3 columns for duplicate data and return a "Duplicate" value.  I am hoping to do this with either a formula or conditional formatting.

The existing formula I have is as follows:

I know this will only identify duplicate values in one column, how do I expand the formula to include additional criteria.

Please see my attached excel file.

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I'm not certain if it can be done with a single formula or not but I don't believe so. What I would do is place your formulas in concurrent columns K:M or wherever you want and if you really want the result in on column you could hide K:M and place a formula in "N" to merge or concatenate the data =K1 & " " & L1 & " " & M1
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Ken Butters
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This works for me:

1) Make all formatting "plain"

2) Select A2:H19

3) Add a formula-based Conditional Formatting rule using this formula:


Choose formatting for this rule as desired.

Any rows within that range for which there are duplicates across all three columns will receive the formatting.
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Worked as suggested.  Thanks for the help!!