Maybe...

=IF(E11=2;VLOOKUP(C11;Taux;3);IF(E11=3;VLOOKUP(C11 ;Taux;4);""))

Ann wrote:

I do not want to see FALSE if formula`s result is FALSE, but when I copy my
formulas to another worksheet I see it. How I can get rid of it ? nPlease,
help.
=IF(E11=2;VLOOKUP(C11;Taux;3);IF(E11=3;VLOOKUP(C11 ;Taux;4)))

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Dave Peterson