A boy wants to give his 12 different books to his 3 friends. The first one will receive 5 books, the second one will receive 4 books and the third one will receive 3 books. In how many ways can the boy give his books to his friends?

Find the number of ways 5 books can be chosen from the 12 books.

Then find the number of ways 4 books can be chosen from the remaining books (that is 12 - 5)

Last find the number of ways 3 books can be chosen from the remaining books (that is 12 - 5 - 4)

Multiply each answer to get the final answer.