railway RRB JE (CBT I + CBT II) Mock Test 2024 Digital Electronics Combinational Circuits Subtractors
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
1
\(D=AB+A\bar B,X=\bar AB\)
2
\(D=A\bar B+A\bar B ,X=A\bar B\)
3
\(D=A \bar B+\bar AB ,X=\bar AB\)
4
\(D=AB+A \bar B,X=A\bar B\)