The number 9 in Roman numerals is written as IX. In Roman numerals, the letter ‘I’ represents 1, and the letter ‘X’ represents 10. When a smaller numeral appears before a larger one, it is subtracted. So, ‘I’ (1) before ‘X’ (10) means 10 minus 1, which equals 9. This is why 9 is written as IX in Roman numerals.
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