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GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
For a binary half-subtractor having two inputs A and B, the correct set of Logical expressions for the output D(=Aminus B) and X(=Borrow) are
A
D = AB + $$\overline A B,X = \overline A B$$
B
$$D = \,\overline A B + A\overline B + A\overline B , X= A\overline B $$
C
$$D = \overline A B + A\overline B ,X = \overline A B$$
D
$$D = AB + \overline A \,\overline {\,B} ,X = A\overline B $$
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