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In Roman numerals, XX represents 20 and C represents 100. According to the rules of Roman numerals, a smaller value numeral can only be placed before a larger value numeral to subtract from it. Since XX (20) is smaller than C (100), it cannot be written in the reverse order as XXC (80) because it would violate the subtractive principle of Roman numerals.

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Q: Why XXC cannot be written for 80?
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Related questions

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XXLL=XXC=80


What does the roman numeral xxcciv?

XX=20 CC=200 IV=4 but a letter with a lower value can only be written ONCE before a letter of greater value. Thus XXCCIV if written as one numeral is not allowed. XXC (100-20) would mean 80 but 80 can be written correctly as LXXX (50+30).


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