I've got an exam coming up and I'm preparing some stuff w/o literature so it's quite hard to solve some exercises..
The question is:
Is it possible to make a computer network of 75 computers so that each computer is connected directly with 15 other computers? Explain.
I've thought of pigeonhole principle, but caught in a loophole.
Started off as 75 pigeons / 14 holes = maximum with 5 connections, not 15.