0 votes 0 votes Anirban Biswas asked Jan 10, 2017 Anirban Biswas 602 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
1 votes 1 votes P[P[P($\Phi$)]] contains 4 elememts. Now, #non-empty subsets = $\binom{4}{1}+\binom{4}{2}+\binom{4}{3}$ = 24 - $\binom{4}{0} - \binom{4}{4}$ = 14 Sushant Gokhale answered Jan 12, 2017 Sushant Gokhale comment Share Follow See all 0 reply Please log in or register to add a comment.