Exam-style question
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Which expression is equivalent to NOT(A AND B)?.
- A.NOT A AND NOT B
- B.NOT A OR NOT B
- C.A OR B
- D.A AND B
Model answer
What a good answer should say
- NOT A OR NOT B
Explanation
Why this works
De Morgan’s law states that NOT(A AND B) is equivalent to NOT A OR NOT B.
Common mistake
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