Question

On subtracting (010110)2 from (1011001)2 using 2’s complement, we get ____________

(a) 0111001

(b) 1100101

(c) 0110110

(d) 1000011

I had been asked this question by my college professor while I was bunking the class.

I want to ask this question from 1’s, 2’s, 9’s & 10’s Complements in portion Number System and Codes of Digital Circuits

Answer 1

Correct choice is (d) 1000011

For explanation: Steps For Subtraction using 2’s complement are:

-> 2’s complement of the subtrahend is determined and added to the minuend.

-> If the result has a carry, then it is dropped and the result is positive.

->   Else, if there is no carry, then 2’s complement of the result is found out and a ‘-’ sign preceeds the result.