question_answer

A proper combination of 3 NOT and 1 AND gates is shown. If A = 0, B = 1, C = 1 then the output of this combination is             

A) 1                                             

B) zero

C) not predictable                                

D) None of these

Correct Answer: B

Solution :

The simplified circuit is shown in figure below. So, output \[Y=\bar{A}.\bar{B}.\vec{C}\] If \[A=0,\,B=1,C=1\] \[\therefore \] \[Y=\bar{0}.\bar{1}.\bar{1}=1.0.0=0\]