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Open By Majority (Posted on 2004-03-03) Difficulty: 3 of 5
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?

See The Solution Submitted by Brian Smith    
Rating: 4.1429 (7 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: ?!? Master Key | Comment 22 of 45 |
(In reply to ?!? Master Key by Stelian Trandafir)

There is nothing tricky or unrealistic about having one key open multiple locks. When the official solution is posted, it will almost certainly specify 10 locks and 5 "master keys". 
  Posted by Penny on 2004-03-04 09:58:57

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