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?
(In reply to re(2): About the keys and locks
by Brian Smith)
Not to further dwell on this puzzle, the solution 10locks, 3 keys per lock 30 keys in total is correct or not?