I want to make sentence fulfilling this condition:
Three groups consist of different people in each, let's say "A people", "B people, "C people"
Is it,
"Three people group"
or
"Three people groups"
I'm confused about plural things in plural group. Could anyone explain me with examples?
I think my question's title is confusing but I have no good words to make it. If this question is a duplicate, please let me know!