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Question
When A = ϕ, then the number of elements in P(P(A)) is ____________.
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Solution
A = ϕ
Then n(P(A)) = 1
⇒ n(P(P(A))) = 2n(P(A))
= 2' = 2
i.e. n(P(P(A))) = 2
Then n(P(A)) = 1
⇒ n(P(P(A))) = 2n(P(A))
= 2' = 2
i.e. n(P(P(A))) = 2Suggest Corrections
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