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Question

The power set of {1,2} is

A
{1},{2}
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B
{{1},{2},{1,2}}
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C
{1,2}
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D
{,{1},{2},{1,2}}
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Solution

The correct option is D {,{1},{2},{1,2}}
The power set of any set S is the set of all subsets of S.
Consider S={1,2}
Note that empty set is a subset of every set and every set is a subset of itself.
Also, {1} and {2} are subsets of S with one element each.
The power set of S,P(S)={ϕ,1,2,{1,2}}

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