The Number of Labelled possible graph given below ?
what I did was →
we doesn’t remove any of the edge out of 4 = $\binom{4}{0}$ [Because a Graph is sub-graph of itself]
we can remove any of one edge out of 4 = $\binom{4}{1}$
we can remove any of the two edges out of 4 = $\binom{4}{2}$
similarly , $\binom{4}{3}$ , $\binom{4}{4 }$
then , add of the them