Which of the following is (are) true?....

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Which of the following is (are) true?
(1) \( (p \wedge q) \wedge r \equiv p \wedge(q \wedge r) \)
\( \mathrm{P} \)
(2) \( (p \vee q) \vee r \equiv p \vee(q \vee r) \)
W
(3) \( (p \wedge q) \wedge r \equiv p \vee(q \wedge r) \)
(4) \( (p \vee q) \vee r \equiv p \vee(q \wedge r) \)


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