Question 15
A skyscraper has 7 lifts, but each of them stops at only 6 floors. Nevertheless, for any two floors there is always a lift that connects the two floors directly.
Show that the skyscraper can have at most 14 floors, and that such a skyscraper with 14 floors can actually be realised.
Show that the skyscraper can have at most 14 floors, and that such a skyscraper with 14 floors can actually be realised.