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Radioactive Coins (Posted on 2006-10-17) Difficulty: 5 of 5
You have N coins, 2 of which are radioactive. You have a radioactivity detector which can test any subset of the coins at a time, and return the number of radioactive coins in the group (i.e. it returns 0, 1 or 2). You have to find the radioactive coins, using not more than 10 tests. What is the largest N for which this is possible?

No Solution Yet Submitted by David Shin    
Rating: 4.5000 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: A better solution | Comment 4 of 18 |
(In reply to A better solution by Joel)

Joel, I tried to improve on your solution but was not able to get above the 108 that you listed. I will be suprised if a higher number is found. L.L.
  Posted by Leming on 2006-10-18 15:43:46

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