Exam-style question
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Which Boolean expression is true when exactly one of A and B is true?.
- A.A AND B
- B.A OR B
- C.(A OR B) AND NOT (A AND B)
- D.NOT A AND NOT B
Model answer
What a good answer should say
- (A OR B) AND NOT (A AND B)
Explanation
Why this works
A OR B requires at least one input to be true. NOT (A AND B) prevents both inputs from being true, leaving exactly one true input.
Common mistake
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