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No of elements of power set will be $2^{n}$ . here n is element of set 

so given set has 2 elements then power set has $2^{2}$ = 4 elements(Ans option d)

which are { $\phi$ , {A,B}, {C}, { { A,B},C} } 

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TWO ELEMENTS SO NUMBER ELEMENTS =2^2=4

{   ∅,  {{A,B}},  {C},  {{A,B},C}  }

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