The Roman numeral “MMMCMXC” represents the number 3990.

Here’s the breakdown:

• MMM represents 3000 (three thousands).
• CM represents 900 (one less than a thousand).
• XC represents 90 (ten less than a hundred).

When you add these Roman numerals together, you get 3000 + 900 + 90, which equals 3990.

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