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XXVII = 27. XXVII squared = XXVII(X+X+V+I+I) = 27(10+10+5+1+1). Multiplying out the brackets = CCLXX+CCLXX+CXXXV+XXVII+XXVII = 270+270+135+27+27. When summed up = DCCXXVIIII = 729 or IDCCXXX = 730-1 but not as DCCXXIX. Numerical values: M=1000, D=500, C=100, L=50, X=10, V=5, I=1.

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16y ago

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