Discussion
Which of the following is/are tautology?
Answer: B
Correct answer: a ^ b → b v c
If the antecedent \( a \land b \) is true then b is true, so \( b \lor c \) is true and the implication holds; if the antecedent is false the implication holds vacuously. The other two fail: the first when a is true and b false, and the third when a is false, b true and c false.
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