XVII and XVIII
MDCIX
CXV = 115
It is: CM = 900
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1 is not a Roman numeral, you numeral should be written as XVIII and it represents the number 18
My Three Sons - 1960 Roman Holiday 3-18 was released on: USA: 17 January 1963
In ascending order (16, 16, 17, 17, 17, 18, 18) it is 17 that is in the middle.
The equivalent Roman numeral for 18 is XVIII
The Roman numeral for 17 is XVII
The fraction 17/18 is the same as 17 divided by 18. 17 ÷ 18 = 0.94444 . . .
The Roman numeral for 18 is XVIII.
The Roman numeral for 17 is XVII