It should सेबें as apples is plural not singular
सेब is a masculine word so the plural is simply सेब.
क्या An apple लिखना भी सही रहेगा?
But colloquially I'd guess one doesn't usually say एक सेब but just सेब
What is the meaning of masculine words
Samjhane ke liye "kai seb" aur sentence me "sebon" use hota hai
Y we use the apples. it should be the apple, coz there are only seb not seben.