Find the Fake Coin
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You have three coins that should have the same weight. They are colored red, green, and blue so you can tell them apart. One of the coins is either heavier or lighter than the other two. Can you determine the fake coin in two weighing operations? There is also a chance that the three coins are all genuine.
Contributed by: S. M. Blinder (March 2011)
Based on a Demonstration by: Ed Pegg Jr
Open content licensed under CC BY-NC-SA
"Find the Fake Coin"
Wolfram Demonstrations Project
Published: March 7 2011