How many elements are there in the power set of set $A$ = {{ $ϕ$ }, { $ϕ$ , { $ϕ$ }}}?

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Solution

The correct option is C 4
$A$ = {{ $ϕ$ }, { $ϕ$ , { $ϕ$ }}}
So, set $A$ consists of two elements i.e., { $ϕ$ } and { $ϕ$ , { $ϕ$ }}
So, the number of elements in the power set of Set $A$ is $2^{2} = 4$ .

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