Data validation

[efernandes67]

Hi.

I need to do some data validation in a range of cells ( ex:A1;B1 and C1)

1 - Only numbers are allowed
2 - Prevent duplicate numbers

Best regards,
Elio

[daddylonglegs]

Try this

Select A1:C1 with A1 active cell

Data > Validation > Allow > Custom

and apply this formula

=ISNUMBER(A1)*COUNTIF($A1:$C1,A1)=1