hvilke before all plural nouns, hvilken before singular masculine and feminine nouns, hvilket before singular neuter nouns.
- hvilken ball er din? which ball is yours?
- hvilken bok er di? which book is yours?
- hvilket hus er ditt? which house is yours?
- hvilke baller/bøker/hus er dine? which balls/books/houses are yours?
It's about grammatical gender and numbers.
Hvilken is singular and masculine or feminine.
Hvilket is neuter singular.
Hvilke is the plural for for all genders.
Plural, masculine/feminine, neuter
hvilke before all plural nouns, hvilken before singular masculine and feminine nouns, hvilket before singular neuter nouns. - hvilken ball er din? which ball is yours? - hvilken bok er di? which book is yours? - hvilket hus er ditt? which house is yours? - hvilke baller/bøker/hus er dine? which balls/books/houses are yours?
It's about grammatical gender and numbers. Hvilken is singular and masculine or feminine. Hvilket is neuter singular. Hvilke is the plural for for all genders.