for example a is numeral 1, b is numeral 2, c is 3, d is 4, e is 5 f is 6 and so on
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Roman numeral is used to mark valence. If an atom, or metal atom has only one valence, you can spare writing it
It was a combination of civilisations. We use the Indo-Arabic system.
The Roman numeral system does not use the letter A.
it would equal 400 but it is the incorrect way of writing 400. the way of writing 400 is CD