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How can we represent 900? CM?

Posted by xxoo at 2007-08-25 13:33:47 on Problem 3353 
Only the following are allowed:

IV = 5 - 1 = 4

IX = 10 - 1 = 9

XL = 50 - 10 = 40

XC = 100 - 10 = 90

CD = 500 - 100 = 400
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