Which one of the following is not an octal number

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Which one of the following is not an octal number:

  1. 66
  2. 29
  3. 147
  4. 76

Correct answer: 2. 29

The octal number system involves digits from 0 to 7. Binary numbers can be converted to Octal numbers by grouping consecutive binary digits into the group of three (starting from the right). See Example for converting 1100111 to 147 of octal

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