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On subtracting (01010)2 from (11110)2 using 1’s complement, we get ____________

(a) 01001

(b) 11010

(c) 10101

(d) 10100

I have been asked this question in examination.

Question is taken from 1’s, 2’s, 9’s & 10’s Complements in section Number System and Codes of Digital Circuits

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Right option is (d) 10100

For explanation: Steps For Subtraction using 1’s complement are:

-> 1’s complement of the subtrahend is determined and added to the minuend.

-> If the result has a carry, then it is dropped and 1 is added to the last bit of the result.

-> Else, if there is no carry, then 1’s complement of the result is found out and a ‘-’ sign preceeds the result.

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