| 21. | Closeness in any number system is defined by a metric.
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| 22. | Egyptian numerals date back to the Abydos record the use of this number system.
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| 23. | The model numbers are based on the binary number system.
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| 24. | :: The bit about the complicated Danish number system recalls a memory of mine.
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| 25. | General properties of mixed radix number systems also apply to the factorial number system.
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| 26. | The traditional Chamorro number system was replaced by Spanish numbers.
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| 27. | The Mangarevan people had developed a binary number system 300 years ahead of Europeans.
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| 28. | It was around this time that the current serial number system appears as well.
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| 29. | The type of number system affects the way it works.
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| 30. | General properties of mixed radix number systems also apply to the factorial number system.
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