1.

How many elements has P(A) , if A = ϕ?

Answer»

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)] = 2= 1

Hence, P(A) has one element.



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