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| Q. |
Let P(S) denote the power set of set S. which of the is always true |
| A. | P(P(s))=p(s) |
| B. | P(S)∩ S= P(S) |
| C. | P(S)∩P(P(S)) ={Ф} |
| D. | None |
| Answer» C. P(S)∩P(P(S)) ={Ф} | |
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