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  The rightmost position in a binary number is units; moving to the left, the next position is twos; the next is fours; the next is eights; then sixteens; then thirtytwos... 
  In the hexadecimal (or hex) system there are sixteen numerals: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E, and F. Zero through nine have the same value as a decimal numeral, and A is ten, B is eleven, C is twelve, D is thirteen, E is fourteen, and F is fifteen. 
  The binary number system is also referred to as "base two" since each position in a binary number represents a power of two  a number that can be written as 2^n, where n is an integer. 
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