If \( A \) is a finite set having \( n \) elements, then \( P(A) \) has (A) \( 2 n \) elements (...

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If \( A \) is a finite set having \( n \) elements, then \( P(A) \) has
(A) \( 2 n \) elements
(B) \( 2^{n} \) elements
(C) \( n \) elements
(D) none of these
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