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Riya wrote these four Roman numerals on cards. Which of them are NOT valid Roman numerals?

Class 6Roman NumeralsNumbers
  • AA only
  • BB and C
  • CC and D
  • DA and C

Step-by-Step Solution

A: IIII is wrong because a symbol is never repeated more than 3 times (4 is IV). C: VX is wrong because V is never subtracted (5 is just V). B: XC and D: XL are correct.
Answer: D) A and C

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