uk to ten hien, ban giup minh bai toan nay voi na co the lap duoc bao nhieu so co 8 chu so tu1,2,3,4,5 6trong do 1va6 xuat hien 2 lan con cac so khac xuat hien 1 lan
uk to ten hien, o to moi vao dien dan ma ban giup minh bai toan nay voi na co the lap duoc bao nhieu so co 8 chu so tu1,2,3,4,5 6trong do 1va6 xuat hien 2 lan con cac so khac xuat hien 1 lan