Multiple choice

Which of the following is not an octal number?

  1. 32

  2. 75

  3. 16

  4. 902
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Octal number system uses only digits 0 through 7. Checking each option: 32 (valid), 75 (valid), 16 (valid), 902 (contains digit 9, which is invalid in octal). Therefore, 902 cannot be an octal number.

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