For a binary half-subtractor having two inputs A and B,

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

1. D = AB + A B, X = A B
2. D = A B + A B, X = A B
3. D = A B + A B, X = A B
4. D = AB + A B, X = A B

Correct Option: C

Truth-table for half-subtractor

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