Try

=OR($C$9="Yes",$C$9="No")


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Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting, LLC
www.cpearson.com



"Shawn" wrote in message
...
I have this formula in a data valadation: =C9=Yes

This won't allow any entry into this cell but "Yes".

I would like a formula that would allow a "Yes" or a "No".
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Thanks
Shawn