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?

(In reply to re: No Subject by Sam)

Besides, this is not "The Odd Coin" (pid 40). McWorter added an additional restriction: You can't use the results of earlier weighings to determine which coins to test in later weighings.

Posted by TomM on 2005-06-04 16:49:51