If A = {$\phi$, {$\phi$}}, then the power set of A is

A {$\phi$, {$\phi$}, A} {$\phi$, {$\phi$}, {{$\phi$}}, A} none of these

{$\phi$, {$\phi$}, {{$\phi$}}, A}

Power set means set of all the subjects ∴ power set of A = {$\phi$, {$\phi$}, {{$\phi$}}, A} Hence (3) is the correct answer.