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Mathematics of an Ancient Computing Device - Editorial Review

Author(s): 
Dean Clark, Lisa Chen

An equal-arm balance with a set of known weights (usually stones) has been used to determine the weight of objects for centuries. This site consists of a LiveMath application for exploring the problem of determining a necessary and sufficient condition on the "stones" so that every integer-weighted object within a specified range can be weighed. A short set of exercises leading the reader through the mathematics is included.

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