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Question

The power set of a singleton set has elements in all.

A
1
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B
0
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C
2
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D
4
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Solution

The correct option is C 2
Let us consider an arbitary singleton set, say A={a}.
Since every set is a subset of itself and empty set is a subset of every set, we have ϕ and A to be subsets of A.
Also, these are the only subsets of A.
Thus, Power set of A, P(A)={ϕ,A}
n(P(A))=2

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