This week's puzzle is a weighing problem. I have adapted it from one given in Martin Gardner's book: "Mathematical Puzzles and Diversions".
The first eleven are being paid their match fees in gold sovereigns. Each player gets a stack of ten gold sovereigns. One stack of coins however is entirely counterfeit, but you do not know which one. You do know the weight of a genuine gold sovereign and you know that each counterfeit sovereign weighs one gramme more than it should. You may weigh the coins on a pointer scale that indicates the weight of the coins on its pan. What is the smallest number of weighings necessary to determine which stack is counterfeit?
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