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Two. 0 and 1. Any system uses as many single digits as the nominal base.

Base 10 uses 10: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

Base 16 (hexadecimal) uses 16: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e and f.

etc.

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Q: How many digits are used in a binary number system?
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