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An octal number is a number that uses base-eight notation instead of base-ten. This means that instead of having the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9, it only uses the digits 0, 1, 2, 3, 4, 5, 6, and 7. The digits 8 and nine are not used.

This doesn't mean that those numbers can't be expressed though, it simply means that they are expressed differently. In octal, the value eight would be expressed as "10" and the value nine as "11".

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13y ago

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