Why does Duolingo require that the second instance of "students" appear in genitive? Can't they both be written in the same way (nominative)??
nominative - with 2, 3, 4 and other numerals ending with 2, 3, 4 (except for 12, 13, 14). Genitive - with all the others.
Thanks! I just figured out I didn't read the hints for this lesson... :-p