I suspect this question was taken from copywritten material, which is not allowed. Otherwise, you left out some crucial information.
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50 is an Arabic numeral and its Roman equivalent is L
The Roman numeral of CCLI is equivalent to the Arabic numeral of 251
MMCVI is not an Arabic numeral. It is the Roman numeral for 2106.
The Roman numeral CCLXXX is equivalent to the Arabic numeral 280.
The number 34 is represented by the Roman numeral XXXIV