![]() There are also other number systems, such as octal (base-8), which is used in some computer programming applications, and Roman numerals, which were used in ancient times for counting and arithmetic. For example, in the hexadecimal number A7F, the digit F represents the 16^0 (1) place, the digit 7 represents the 16^1 (16) place, and the digit A represents the 16^2 (256) place. Each position represents a power of 16, so the value of a digit depends on its position in the number. It uses 16 symbols (0-9 and A-F) and positions to represent numbers.
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