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Find the Counterfeit

An agent investigating counterfeit has ten stacks of silver coins in front of him, ten pieces in each stack.  The officer knows for sure that one of these ten stacks consists of nothing but counterfeit coins, and that each of these bad coins is one gram heavier than they should be.  He wants to find out which stack is bad money.  The question: what is the smallest possible number of weighings that the officer has to do in order to make find the counterfeit?    >>>


Riddle

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