question_answer

Which logic gate is represented by the following combination of logic gates                                         [AIIMS 2004]

A)            OR 

B)            NAND

C)            AND                                         

D)            NOR

Correct Answer: C

Solution :

                   \[Y=\overline{\bar{A}+\bar{B}}\] According to De morgan?s theorem \[Y=\overline{\bar{A}+\bar{B}}=\bar{\bar{A}}.\bar{\bar{B}}=A.B\] This is the output equation of ?AND? gate.