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VIIII-XI-LXXXVIIII or IX-XI-IXC. Note that 89 in Roman numerals is not LXXXIX. Alternative answer According to the website Algebra.com the accepted method of writting Roman numerals for 9.11.89 can be written as IX.XI.LXXXIX. Roman numerals are read from left to right and always start with the highest value numeral. Clearly LXXXIX (50 + 30 + 9) and LXXXVIIII (50 + 30 + 5 + 4) both comply with this rule and are both acceptable methods of writing 89, the former method is more generally used simply because it is shorter and neater. The alternative method IXC (9 less than 100)which begins with an I (the symbol for 1) is clearly not correct as it flouts the rule. Also, according to Algebra.com... I can be placed before V and X but should not preceed a higher value numeral. The date 9.11.89 could also be written as 9.11.1989 which is... IX.XI.MCMLXXXIX.

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