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Which pair is a standard subtractive Roman form?

AIL for 49
BVX for 5
CXC for 90
DIC for 99
Answer & Solution
Correct answer: C. XC for 90
1. Only IV, IX, XL, XC, CD and CM are standard subtractive forms. 2. XC means 100 minus 10, which is 90. 3. IL, VX and IC are not among the accepted forms. _Source: Wikipedia, Roman numerals, Standard form_
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