Which of the following is a NOT a correct identity in Boolean Algebra?
2018
Which of the following is a NOT a correct identity in Boolean Algebra?
- A.
A + AB = A
- B.
A(A+B) = B
- C.
AB + AB' = A
- D.
(A+B)(A+B') = A
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Correct answer: B
Option 1 states A(A+B) = B. Using the distributive law, this expands to AA + AB. Since AA equals A and A + AB simplifies to A via absorption, the expression equals A, not B. Therefore, this identity is incorrect.