A tautology is a Boolean formula that is always true. Which of the following is a tautology?
A tautology is a Boolean formula that is always true. Which of the following is a tautology? Correct Answer x + y̅ + x̅
Calculation:
x + y̅ + x̅
= x + x̅ + y̅
= 1 + y̅
= 1
So, it is always true.
Hence option 3 is correct.
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Feb 20, 2025