I think it might be 13. Either that or 7.
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If you mean XIII then it is the equivalent of 13
13
i, ii, iii, iv, v, vi, vii, viii, ix, x, xi, xii, xiii = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ,13 The numerals are usually in upper case letters.
A positive number. Positive Number x Positive Number = Positive Number Positive Number x Negative Number = Negative Number Negative Number x Negative Number = Positive Number
A real number which is not a rational number is an irrational number.