Question

fie A = {1,2,3,....99,100} determinati nr submultimilor B inclus iind ca {1,2 } inclus in B inclus in {1,2...81}

Answer 1

multimea b :
-2 elemente {1,2}
-3 elemente {1,2,3},{1,2,4}..{1,2,81} adica 79 multimi
-4 elemente { 1,2,3,4}..{1,2,3,5}..........{1,2,80,81}-78+77+..1=78*79 supra 2
.
.
-cu 81 elemente {1,2..81}==> o multime
Deci 2⁷⁹ submultimi