Question

For the following logic gates circuit, what is the correct expression for the output ?

• A. $Y=A+B$
• B. $Y=\overline{A+B}$
• C. $Y=A.(A+B)$
• D. $Y=A.(A.B)$

Answer 1

The correct option is C $Y=A.(A+B)$



For the given gates combination, the output of OR is an input for an AND gate.
So, the inputs of the AND gate are, $A+B$ and $A$

$\therefore Y=A.(A+B)$

Hence, $\left(D\right)$ is the correct answer.

Why this Question? Application: This question tests the combination of two different gates.