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When a smaller roman numeral comes before a bigger roman numeral, the smaller one usually gets subtracted from the bigger roman numeral. For example: XL = X (10) - L (50) = 40 IV = I (1) - V (5) = 4 CM = C (100) - M (1000) = 900
The Roman numeral IV represents the number 4 in our modern Arabic numeral system. In Roman numerals, "I" represents 1 and "V" represents 5. When a smaller numeral (I) is placed before a larger numeral (V), it is subtracted from the larger numeral, resulting in 4.
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I am not sure that I understand your question. Do you mean which of the two numerals V or D should not be repeated in a numeral? If that is you question then the answer is that neither of them should be repeated. V = 5, so VV would in theory = 10 but there is already a Roman numeral for 10, which is X. D = 500 and in theory DD would = 1000 but again there is an existing Roman numeral for 1000, which is M.
Yes, the M can be repeated up to 3 times side by side before a numeral would be considered invalid. MMM = 3000 MMMM = Invalid roman numeral. MMMCM = 3900 and is valid.