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How many elements does A=0 have ?

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P(A) is the power set of set A.

Number of elements of P(A)=2^n, where n is the number of elements of the set A.

Given A=\empty, then the number of elements of set A=0.

Number of elements of P(A)=2^n=2^0=1.

Hence P(A) has one element.

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