Write 999 in Roman numerals.

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CMXCIX

CLLVII

CMVIII

XCVIII

answer is D.

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Detailed Solution

CMXCIX

To write 999 in Roman numerals, we need to break it down into smaller values using subtraction, as Roman numerals follow specific rules.

999 = 900 + 90 + 9
We split the number into three parts to simplify it.
900 is written as CM:
- C = 100, M = 1000.
- When a smaller value (C) appears before a larger value (M), it is subtracted.
- So, 900 = 1000 - 100 = CM.
90 is written as XC:
- X = 10, C = 100.
- Here, the smaller value (X) comes before the larger value (C), so it is subtracted.
- So, 90 = 100 - 10 = XC.
9 is written as IX:
- I = 1, X = 10.
- Again, the smaller value (I) is placed before the larger value (X), meaning it is subtracted.
- So, 9 = 10 - 1 = IX.

Now, combine all three parts:
999 = 900 + 90 + 9 = CM + XC + IX = CMXCIX

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