Question

B={x €N/10 divizibil cu (x-2)} ajutor

Answer 1

D10∈{1,2,5,10}
x-2 ∈{1,2,5,10},
aduni 2 la toate elementele si vei obtine
 x∈ {3,4,7,12}
⇒B={3,4,7,12}