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Which of the following is not a valid octal number?

  1. 100
  2. 101
  3. 667
  4. 668

Answer (Detailed Solution Below)

Option 4 : 668

Detailed Solution

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Concept:

The radix or base of a number system is defined as the number of different digits which can occur in each position in the number system

Application:

For octal number system base is 8 hence there are 8 different digits from (0 - 7)

Any number containing digit greater than 7 is invalid octal number.

So, 668 is invalid octal number
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