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In a half subtractor, a negative result occurs when the minuend (the first input) is less than the subtrahend (the second input). This situation is typically represented in binary arithmetic by borrowing, which affects the outputs. The half subtractor will output a '0' for the difference when the minuend is less than the subtrahend, while the borrow output will be '1' to indicate that a borrowing operation is necessary. Thus, a negative result signifies that the subtraction cannot be performed without adjusting for borrowing.

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6d ago

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