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2009 as a product of its prime factors is 7*7*41. MMVIIII as a product of its prime factors is VII*VII*XXXXI in Roman numerals. Note that XXXXVIIII (49)*XXXXI (41) = MMVIIII (2009) when multiplied out. And that IL (50-1)*XLI (51-10) = IMMX (2010-1) when multiplied out. But they both have the same numerical values. Conventionally accept wisdom tells us that Roman numerals read from left to right and always start with the highest value numeral. 41 can indeed be written as XLI (40 + 1) or as XXXXI (40 + 1), although the former is shorter and more commonly used. 49 can be written as either XLIX (40 + 9), XLVIII (40 + 5 + 4) or even XXXXVIIII (40 + 5 + 4) as you might expect the first of these three alternatives is the common form, as it is the shortest and simplest to write. The propsed alternative of IL is simply wrong. It begins with I (1) which is patently lower in value than L (50), also according to the website Algebra.com... "I may be placed before V or X but should not be placed in front of any higher value numeral," such as L. Additionally the answer to the problem; 2009 should correctly be written as MMIX (2000 + 9) or even MMVIIII (2000 = 5 + 4) but the proposed alternative of IMMX which incorrectly places an I (1) before M (1000) is patently plain wrong.

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14y ago
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13y ago

The prime factors of 2,009 are 7 and 41. 7 x 41 = 287

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13y ago

2009 = 7 * 7 * 41

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Q: What is 2009 as a product of its prime factors in roman numerals?
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