Which of the following is true?....

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Which of the following is true?
\( \mathrm{P} \)
(1) \( A=\{1,7,6\} \) and \( B=\{7,2,1\} \) then, \( 1,2,7 \in A \)
W
(2) \( A=\{a, b, c\} \) and \( B=\{b, c, d\} \) then \( a, b, c \in B \)
(3) \( A=\{a, e, i, o, u\} \) and \( B=\{a, b, c, d, \ldots, x, y \), \( z\} \) then \( a, e, i, o, u \in B \)
(4) \( A=\{1,2,1,2\} \) and \( B=\{a, b, c\} \) then, \( 1,2 \in B^{\circ} \)


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