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Which one of the following represents the number 'eleven thousand eleven hundred eleven'?

  • A.111111
  • B.12111
  • C.11000110011
  • D.XIXIXI

Answer: B

The number is 12111.

\[ \begin{aligned} 11000 + 1100 + 11 &= 12111 \end{aligned} \]

Eleven hundred is 1100, which carries a thousand into the thousands place, so the number has 12 thousands, 1 hundred and 11. 111111 simply writes 'eleven' three times, 11000110011 writes each part's digits side by side, and XIXIXI is not a valid Roman numeral for the number.

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