Răspuns :
a) x8=>x={1,2,3,4,5,6,7,8,9}=>nr sunt 18,28,38,48,58,68,78,88,98
b) 4x=>x={0,1,2,3,4,5,6,7,8,9}=>nr sunt 40,41,42,43,44,45,46,47,48,49
b) 4x=>x={0,1,2,3,4,5,6,7,8,9}=>nr sunt 40,41,42,43,44,45,46,47,48,49