Multiple choice

Which of the following numbers cannot be an octal number?

  1. 172

  2. 265

  3. 168

  4. 573

  5. 101
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Correct In octal number system, we have 8 digits 0, 1, 2, 3, 4, 5, 6 and 7. So, 168 cannot be an octal number. 8 is not a digit in octal number system.

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