Which of the following is incorrect? \( \mathrm{P} \) (1) \( A(B C)...

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Which of the following is incorrect?
\( \mathrm{P} \)
(1) \( A(B C)=(A B) C \)
W
(2) \( A(B+C)=A B+A C \)
(3) \( \quad A B=B A \)
(4) \( (B+C) D=B D+C D \)
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