0
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The standard numerals we use today are the Hindu-Arabic numerals which are: 0 1 2 3 4 5 6 7 8 and 9
DCCVI
538
XII
C
CXXVI
roman numarals are v,i ,x,c and some other stuff with represent numbers
Your answer is XXI
L
CCCLXII
DCC
1 = I
XXXIX