Multiple choice

Which of the following Boolean expressions is incorrect?

  1. A + A = A

  2. A + AB = B

  3. (A + B) (A + C) = A + BC

  4. (A + B) (A + B) = A

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

According to the absorption law, A + AB = A. The expression A + AB = B is incorrect because the result should be A.