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The above numbers when converted into Roman numerals are XC, IX, CM, M and I respectively and the Romans probably added them together in the following manner:-

XC+IX = IC (90+9 = 99)

CM+IC = IM (900+99 = 999)

M+IMM = IMM (1000+999 = 1999)

I+IMM = MM (1+1999 = 2000)

But today we would add them up in the following manner which leaves the final calculation open to question because:-

XC+IX = XCIX (99)

CM+XCIX = CMXCIX (999)

M+CMXCIX = MCMXCIX (1999)

I+MCMXCIX = ?

It appears that the former way of counting is more plausible than the latter.

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13y ago

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