How many elements has P(A), if A =φ?
We know that if A is a set with m elements i.e., n(A) = m, then n[P(A)] = 2m.
If A = Φ, then n(A) = 0.
∴ n[P(A)] = 20 = 1
Hence, P(A) has one element.
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P(A) has only one element, namely φ.
∴ PW = {φ}