Q.

The output Y of following circuit for given inputs is               [2024]

1 A.B(A+B)  
2 A.B  
3 0  
4 A¯·B  

Ans.

(3)

Y=A¯·B·(A+B¯)

=A¯·B·A+A¯·B·B¯

=A¯·A·B+A¯·B·B¯

=0+0=0