Let S={$\varnothing$,{1}} ,then which of the following is true
1.$\varnothing$ $\epsilon$ 2^{s}
2.{$\varnothing$} $\subseteq$ 2^{s}
3.$\varnothing$ $\subseteq$ 2^{s}
@Manu Can you point out set in 2^{s }which makes ∅ ⊆ 2^{s }:(
when $ \varnothing \epsilon A $ and $\varnothing \epsilon P(A)$ then $ \varnothing \subseteq P(A) $
But I don't think 2nd option {∅}⊆ 2^{s} is correct since it is element in $P(A)$