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Octal and hexadecimal numbers are useful for humans as they compactly represent binary numbers:

  • each octal digit represents exactly 3 binary digits
  • each hexadecimal number represents exactly 4 binary digits

For example, instead of trying to read (and remember) the binary number 100111001001 it can be represented as hexadecimal 0x09c9 or octal 04711 which are easier to read (and remember) for humans.

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