1000 = M, 900 = CM, 90 = XC and 9 = IX. so 1999 would be MCMXCIX.
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1999
1999 = MCMXCIX
That is not a valid Roman numeral.
roman numeral for march 20 1999 is as follows . 03-20-1999 is written as . IIi=XX-MCMXCIX.
the answer to what is the roman numeral for 101 is CI