Question

determinati toate multimile M care indeplinesc simultan conditiile:a){1,2}C M,b)M C {1,2,3,4,5}.

Answer 1

M1={1,2}
M2={1,2,3}
M3={1,2,4}
M4={1,2,5}
M5={1,2,3,4}
M6={1,2,3,5}
M7={1,2,4,5}
M8={1,2,3,4,5}