Question

Which of the following are not valid symbols in octal number system ? 2 9 4 6

Answer 1

9 bcoz it is not an octal number system

Answer 2

9 is not a valid symbol in the octal number system.

Explanation:

Octal Number system is a base-8 number system in a computer, that uses digits between 0 to 7, where 0 and 7 are included.

The binary equivalents of the octal numbers go as follow:

Octal Number             Binary Equivalent

         0                                   000

         1                                    001

         2                                   010

         3                                   011

         4                                   100

         5                                   101

         6                                   110

         7                                   111

From decimal 8 onwards, it goes as 10 and so on...

i.e, decimal 8, 9, 10, 11, 12, 13, 14, 15 in octal are: 10, 11, 12, 13, 14, 15, 16, 17

and from decimal 16 onwards, octal goes with 20 and so on...

Therefore, we won't find 9 in the octal number system.

So, 9 is an invalid number in the octal number system.

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