If A is {{Φ}, {Φ, {Φ}}}, then the power set of A has how many element?
A. 2
B. 4
C. 6
D. 8
Answer:B
If A is {{Φ}, {Φ, {Φ}}}, then the power set of A has how many element?
A. 2 B. 4 C. 6 D. 8
Explanation: The set A has got 2 elements so n(P(A))=4.