4 phan tu.Chac chan 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
Ư(18) = {1, 18, 2, 9, 3, 6}
Ư(18) = {1, 60, 2, 30, 3, 20, 4, 15, 5, 12, 6, 10}
Ư(18, 60) = {1, 2, 3, 6}
thắc mắc là ƯC(18,60) là 4 đúng rồi sao violympic lại k sai vậy???