In decimal we write a number by using a combination of 10 digits (0-9). In base 2, however, numbers are written by using a combination of only 2 digits (0 & 1). We call this number system binary.
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Babylonian numerals have a base of 60 while the Hindu-Arabic numerals have a base of 10
Ten
No, the Roman Numerals are a based less number system.
Two in Roman numerals is II (two capital i's).
Forty two in Roman numerals is written as XLII.