Question

enumerati elementele multimii a = {x/x apartine n,x | 45 si 5 | x}
dau coroana

Answer 1

x|45 ⇒ x∈D₄₅={1,3,5,9,15,45}

5|x ⇒ x∈M₅={0,5,10,15,..}

A=D₄₅∩M₅={5,15,45}