Question

Which of the following is the 1’s complement of 10?
1. 01
2. 110
3. 11
4. 10

Answer 1

Correct Answer - Option 1 : 01

1’s complement:

• 1’s complement simply inverted every bits of input.
• Can be implemented using only NOT gate for each bit of binary number input.  

Example:  110 1’s complement of 110 is 001

Explanation:

Binary Number	1	0
1’s complement	0	1

Hence option 1 is the correct option.