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Question

The power set of C={ϕ} is

A
{ϕ}
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B
{ϕ,{ϕ}}
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C
{{ϕ}}
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D
{0}
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Solution

The correct option is B {ϕ,{ϕ}}
Given C={ϕ}
This means an empty set is an element of set C.
Or, ϕC{ϕ}C
P(C)={ϕ,{ϕ}}

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