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Dec 8, 2016 at 13:41 comment added bujon I am not expert but according to wiki there is nothing like a "valid" roman number. ... The "standard" forms described above reflect typical modern usage rather than a universally accepted convention. Usage in ancient Rome varied greatly and remained inconsistent in medieval and modern times...
Oct 13, 2016 at 16:11 comment added Simon Forsberg Generally, XIIX is not considered to be a valid roman number. Each number can only be written in one and only one way with roman numerals.
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Oct 13, 2016 at 16:12
Oct 13, 2016 at 14:13 history answered bujon CC BY-SA 3.0