The 12 Coin Weighing Problem
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You have 12 coins, labeled with letters M, I, T, F, O, L, K, D, A, N, C, and E. One of the coins is fake, and is heavier or lighter than the others. With help from the mnemonic "ma do like me to find fake coin," three weighings will automatically determine which coin is fake.
Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA
"The 12 Coin Weighing Problem"
Wolfram Demonstrations Project
Published: March 7 2011