For a binary half-subtractor having two inputs A and B, the correct set of logical expression for the outputs D (= A minus B) and X (= borrow) are

This question was previously asked in
ISRO (VSSC) Technical Assistant Electrical 2017 Official Paper
View all ISRO Technician Papers >
  1. D=AB+AB¯,X=A¯B
  2. D=AB¯+AB¯,X=AB¯
  3. D=AB¯+A¯B,X=A¯B
  4. D=AB+AB¯,X=AB¯

Answer (Detailed Solution Below)

Option 3 : D=AB¯+A¯B,X=A¯B
Free
DRDO Technician Fitter (Rank Booster): Mini Mock Test
5.1 K Users
60 Questions 60 Marks 45 Mins

Detailed Solution

Download Solution PDF

Truth Table for half substractor:

A B Difference Borrow
0 0 0 0
0 1 1 1
1 0 1 0
1 1 0 0

 

Difference=AB=AB¯+A¯B

Borrow=X=A¯B

Latest ISRO Technician Updates

Last updated on May 28, 2025

-> ISRO Technician recruitment notification 2025 has been released. 

-> Candidates can apply for the ISRO recruitment 2025 for Technicians from June 2. 

-> A total of 64 vacancies are announced for the recruitment of Technician. 

-> The selection of the candidates is based on their performance in the Written Exam and Skill Test. 

-> Candidates who want a successful selection must refer to the ISRO Technician Previous Year Papers to increase their chances of selection for the Technician post. 

Get Free Access Now
Hot Links: teen patti real money app teen patti real cash teen patti sequence teen patti club