# What is the smallest number of weighings needed to determine which of the stacks is counterfeit?

There are 10 stacks of coins, each consisting of 10 silver dollars. One entire stack is counterfeit. but you do not know which one. You do know the weight of a genuine silver dollar, and you are also told that each counterfeit coin weighs 1 gram more or less than a genuine coin. You have a pointer scale which you use to Weigh the coins.

What is the smallest number of weighings needed to determine which of the stacks is counterfeit?

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