P[P[P($\Phi$)]] contains 4 elememts.
Now, #non-empty subsets
= $\binom{4}{1}+\binom{4}{2}+\binom{4}{3}$
= 2^{4} - $\binom{4}{0} - \binom{4}{4}$
= 14
7090 Points
4676 Points
4224 Points
4014 Points
3982 Points
3138 Points
3088 Points
3004 Points
2976 Points
2824 Points
Gatecse
^ go through