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A balance scale with no measurement markings is used to determine which of nine gold rings, all identical in appearance, is the one that weighs

A balance scale with no measurement markings is used to determine which of nine gold rings, all identical in appearance, is the one that weighs less than the eight others due to replacement of some of the gold with cheaper alloys. What is the minimum number of times that the balance scale must be used for comparison of one or more rings against others in order to determine which one of the nine rings is counterfeit?

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