What is the largest number that can be written in standard Roman numerals?

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A MMMCMXCIX
B IM
C MMMDCCCLXXXVIII
D None of the above

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Answer: A. MMMCMXCIX

In standard Roman numerals I, X, C and M cannot be repeated more than three times, and there is no basic symbol for 5000. So the largest number is 3999 = MMMCMXCIX. 'IM' is not a valid numeral.

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What is the largest number that can be written in standard Roman numerals?

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