That's exactly right. Sorry I wasn't clearer.

"Pete_UK" wrote:

I'm a bit confused. Which column would you use for the check? Suppose
you entered data into S10 - you want to check that S10 is not
contained anywhere in columns E, L or S and neither in A10:S10? Do you
want this flagged up in a cell on row 10 somewhere? Then if you enter
some data in E15, you want the same checks but reported on row 15?

Pete

On Aug 1, 5:48 pm, Emily wrote:
Hi everyone,

I posted a similar question the other day and it was answered, but now my
formula is getting more complicated and no amount of playing around with it
is giving me what I want.

Column E, Column L, and Column S contain a list of text data, which happens
to be numbers (e.g. 1172, 4721, 6743, etc.). Every time I enter a new number
in the columns, I would like another column in the same row to check the
previous entries in all three columns AND the same row and report whether the
exact same number has been entered before (if true="yes", if false="no").

Can anyone give me a hand?
Thanks again.