Đặt số cần tìm là: abc:
Thì a = b = c = n! (cách chọn)
=> (n!)^3 (số)
......................................................................................................................................................................................
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
>-.....................................................................................................................................................................:-SS..................................................................