Question

x-1 divizibil cu 19 ajutor "x = nr. natural

Answer 1

x poate fi 20;39,58,77.....creste din 19 in 19

Answer 2

X-1 div cu 19-> x-1 e multiplu de 19-> x-1€{ 19,38,57, 76,95,etc }=> x€{20,39,58,77,96,...}