Question 1186668



{},{1},{2},{3},{4},{1,2},{1,3},{2,3},{1,4},{2,4},{3,4},{1,2,3},{1,2,4},{1,3,4},{2,3,4},{1,2,3,4}

Subsets: total {{{16}}}
Proper Subsets total: {{{15}}}

{{{1}}} subset with no elements 

{{{4}}} subset with {{{1}}} elements

{{{6}}} subset with{{{ 2}}} elements

{{{4}}} subset with {{{3}}} elements

{{{1}}} subset with {{{4}}} elements


you need subset with{{{ 2}}} elements: {1,2},{1,3},{2,3},{1,4},{2,4},{3,4}