Question

[Trương Ngọc Thuận]

cho day so 5 , 6, 7, 8,9,10,11,12, ....va duoc to nhu sau 5 to mau do ,6 to mauvang, 7 to mau xanh 8to mau tim 9to mau do ,10 to mau vang ,11to mau xanh,12to mau tim .....va cu tiep tuc nhu vay cho den het .hoi ch uso thu 1999 duoc to mau gi