perplexus.info :: Weights and Scales : Classic counterfeit coin problem

Classic counterfeit coin problem (Posted on 2005-06-04)

In the famous "The Odd Coin" problem you are given twelve coins, exactly one of which is lighter or heavier than the other coins. You are to determine the counterfeit coin, and whether it is lighter or heavier than the other coins, in just three weighings with a balance.

Can you solve this problem with the additional restriction that you must decide what coins go on each pan for all three weighings before any weighing takes place?

See The Solution Submitted by McWorter

Rating: 3.7500 (4 votes)

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
re(6): Another way to answer it	McWorter	2005-06-10 22:10:56
re(5): Another way to answer it	Ken Haley	2005-06-10 04:39:39
re(4): Another way to answer it	McWorter	2005-06-07 15:45:50
re(3): Another way to answer it	Ken Haley	2005-06-07 06:08:50
re(2): Another way to answer it	McWorter	2005-06-05 22:35:18
re: Another way to answer it	Charlie	2005-06-05 17:43:52
Another way to answer it	Jennifer	2005-06-05 11:36:10
re(2): Answer	Ken Haley	2005-06-04 23:07:43
re: Answer	Tristan	2005-06-04 23:04:11
re(2): No Subject	TomM	2005-06-04 16:49:51
re: No Subject	Sam	2005-06-04 16:29:40
No Subject	jasper	2005-06-04 16:08:16
Answer	Ken Haley	2005-06-04 16:01:20

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