Question

Fie multimea A={×∈N|4<×≤a,a∈N} si B={y∈N|y divizibil 3}.
Determinarea numerelor naturale a stiind ca multimea A inclus B are 20 de elenmente

Answer 1

Fie multimea A={×∈N|4<×≤a,a∈N} si B={y∈N|y divizibil 3}.
B={ 3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66....+∞}
4<×≤a
A={6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63}