Formal:
* Non applicable: This is the most literal and formal translation.
* Sans objet: This means "without object" and is often used in legal or official documents.
* Ne s'applique pas: This means "does not apply" and is also quite formal.
Informal:
* N/A: This is a common abbreviation used in many languages, including French.
* Pas applicable: This means "not applicable" and is a more casual way to say it.
* Ce n'est pas le cas: This means "this is not the case" and can be used when something is not relevant.
The best way to choose the right translation depends on the situation.