Question 19
The teacher has four gifts, one teddy bear, one bunch of flowers, one robot and one book, to give to Thảo, Nhi, Đức and Hải, one gift each. Hải does not like flowers; Đức does not like books; Nhi does not like robots; Thảo does not like teddy bears. In how many ways can the teacher distribute the gifts so that nobody receives a disliked gift?
