A group of five people want to put a set of locks on a chest and distribute keys to the locks amongst themselves in such a way that all the locks on the chest could be opened only when at least three of them were present to open it.

How many locks would be needed, and how many keys?

You actually should provide why the answer is there, not just the answer to ALL problems on flooble, whether the problem specifies it or not. Explanations should explain to a reader that has no idea on the solution about what the solution is.

Posted by Gamer on 2004-03-03 19:26:50