Question:
When A = ϕ, then the number of elements in P(P(A)) is ____________.
Solution:
A = ϕ
Then n(P(A)) = 1
$\Rightarrow n(P(P(A)))=2^{n(P(A))}$
$=2^{\prime}=2$
i.e. n(P(P(A))) = 2
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