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Det binære talesystem, eller base-2-talesystem, repræsenterer numeriske værdier ved hjælp af to symboler, 0 og 1. Mere specifikt, det sædvanlige base-2-system er en positionsnotation med en radix på 2. På grund af sin enkle implementering i digitale elektroniske kredsløb ved hjælp af logiske porte, det binære system bruges internt af alle moderne computere.

In mathematics and computer science, hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F (or alternatively a–f) to represent values ten to fifteen. For example, the hexadecimal number 2AF3 is equal, in decimal, to (2 × 163) + (10 × 162) + (15 × 161) + (3 × 160) , or 10,995. Each hexadecimal digit represents four binary digits (bits) (also called a "nibble"), and the primary use of hexadecimal notation is as a human-friendly representation of binary coded values in computing and digital electronics. For example, byte values can range from 0 to 255 (decimal) but may be more conveniently represented as two hexadecimal digits in the range 00 through FF. Hexadecimal is also commonly used to represent computer memory addresses.