Question

The resultant gate and its Boolean expression in the given circuit is

• A. $\text{AND}, \overline{\text{A} + \text{B}}$
• B. $\text{NAND}, \text{A} + \text{B}$
• C. $\text{OR}, \text{A} + \text{B}$
• D. $\text{NOR}, \text{A} - \text{B}$

Hint:

A NOR output goes through an inverter, which cancels the bubble.

Answer 1

The Correct Option is C

Step 1: Double inversion:
Two inversions in a row return the original signal.

Step 2: Apply:
A NOR is an OR followed by an inversion. Adding a NOT inverts again, so only the OR remains.

Step 3: Result:
$Y = A + B$, an OR gate, option (C).

Final Answer:
The circuit behaves as an OR gate. \[ \boxed{\text{(C) }\text{OR},\ A+B} \]