Which of the following is not true? \( \mathrm{P} \) (1) \( A+B=B+A...

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Which of the following is not true?
\( \mathrm{P} \)
(1) \( A+B=B+A \)
W
(2) \( (A+B)+C=A+(B+C) \)
(3) \( K(A+B)=K A+K B \)
(4) \( A-B=B-A \)
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