Question

Aflati cate submultimi cu doua elemente are multimea {1,2,3,4,5,6}

Answer 1

Avem combinari de 6 elemente luate cate 2: C=6!/[2!(6-2)!]=720/48=15(multimea {1,2,3,4,5,6} are 15 submutimi cu 2 elemente)