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

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ISRO (VSSC) Technical Assistant Electrical 2017 Official Paper
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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

 

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