ei prøve · test
Feminine (ei)
Indefinite singular
ei prøve
Definite singular
prøva
Indefinite plural
prøver
Definite plural
prøvene
Feminine nouns (ei) can always be written with en as well: ei bok, boka or en bok, boken. Both are correct Bokmål.
How to guess the gender Nouns: gender and articles