Question

Determinati toate submultimile multimi F={1,2,3,4}

Answer 1

F={1,2,3,4}
{1} , {2}, {3} ,{4}, {1,2} ,{2,3},  {3,4}, {1,3} , {1,4}, {2,4} , {1,2,3}, {1,2,4} , {1,3,4}
{2,3,4} ,{1,2,3,4} si multimea vida.

Trebuie sa fie 16 in total. 

Answer 2

Nr de subultimi a unei multimi se afla dupa formula 2^cardinal multime.Cum card F=4 nr de submutimi va fi 2^4=16:M1={1};M2={2};M3={3};M4={4};M5={1,2};M6={1,3};M7={1,4};M8={1,2,3};M9={2,3,4};M10={1,2,4};M11={1,3,4};M12={2,3};M13={3,4};M14={2,4};M15={1,2,3,4};M16=multimea vida