The 2’s complement of 1010101 is ______.

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SSC JE EE Previous Year Paper 15 (Held On: 26 Sep 2019 Evening)
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  1. 0101010
  2. 1110011
  3. 0101011
  4. 1101010

Answer (Detailed Solution Below)

Option 3 : 0101011
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F1 U.B Madhu 07.01.20 D26

Tips and Tricks:

Steps to writing 2’s complement to any binary number:

  • Start from right to left and search for the first ‘1’
  • Write down the bits until that first ‘1’ as it is.
  • Write down the remaining left bits with their respective complement.

 

Example: Let the given number is: 100100

The 2’s complement is as shown.

F1 U.B Madhu 07.01.20 D27

Given number is 1010101

2’s complement = 0101011
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