Let \( A=\{a, b\{a, b\}\} \), where \( P(A) \) is the power set of \( A \), then which of the fo....

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Let \( A=\{a, b\{a, b\}\} \), where \( P(A) \) is the power set of
P
\( A \), then which of the following is/are true?
(1) \( b \in A \)
(2) \( \quad\{\{\mathrm{a}, \mathrm{b}\}\} \subset P(A) \)
(3) \( \{b\} \in A \)
(4) \( \{\mathrm{a}, \mathrm{b}\} \subset \mathrm{P}(A) \)


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