Multiple choice

Which one of the following expressions represents the sum output of a Half - Adder?

  1. A.B

  2. A + B

  3. A.B - A.B

  4. A.B + A.B

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sum output of a Half Adder is the XOR operation: A XOR B = A·B' + A'·B. This produces 1 only when exactly one input is 1. A·B represents AND, A+B represents OR, and the expression in C is incomplete - it should represent complemented product terms for the XOR function.