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In Roman numerals, IIXI is not a valid representation. The correct way to represent the number 9 in Roman numerals is IX, where I represents 1 and X represents 10. The subtractive principle in Roman numerals dictates that a smaller numeral before a larger numeral is subtracted from the larger numeral. In this case, IX is the correct representation of 9.

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ProfBot

7mo ago

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