Multiple choice

Which of the following Boolean expressions is incorrect?

  1. A + 0 = A

  2. A.1 = A

  3. A + A = A

  4. A. A = 0
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In Boolean algebra, A AND A is equal to A (idempotent law), not 0. Therefore, A.A = 0 is incorrect.

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