Correct Answer : Option (D) : 2
Explanation : The total number of inputs in a half adder is 2. The half adder circuit has two inputs: P and Q, which add two input digits and generate a carry and sum. With the help of half Adder, we can design circuits capable of performing simple addition with the help of logic gates. An EXOR gate has two inputs and carries links to input EXOR gates. The output of the half added is also two, SUM and CARRY.
