XC = 90
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the roman numerals L,X,M,C,I,D ARE the roman numerals that can be used only 3 times
500 + 300 + 20 + 9 = d c c c x x i x
(c)(x)(x)(x)mmvi
Adding them together in sequence - you get 10+100+100+100+10+100+1+5=426 426 in roman numerals is CDXXVI
The equivalent of the given Roman numerals are 10, 100 and 5 respectively