What is the difference between Xの数人 and 数人のX?


"私の友人 **の数人** が今年日本へやってきた。"

"部屋には **数人の** 学生がいた。"




It's simple:

  * **学生の数人** : some of the students  
(You're picking some members from a bigger group)

  * **数人の学生** : some students




It's simple:

  * **学生の数人** : some of the students  
(You're picking some members from a bigger group)

  * **数人の学生** : some students

