Question

In the adjoining circuit of logic gate, the output $Y$ becomes zero if the inputs are

• A. $A=1,B=1,C=0$
• B. $A=0,B=0,C=0$
• C. $A=0,B=1,C=1$
• D. $A=1,B=0,C=0$

Answer 1

The correct option is A $A=1,B=1,C=0$

The output $Y=\overline{(A\cdot B)\cdot C}=\overline{(A\cdot B)}+\overline{\overline{C}}$
$=\overline{(A\cdot B)}+C$
So, $Y=0$ if $A=1,B=1$ and $C=0$.