Need these within 1 hour !!!

1. In how many way could 15 different books be divided equally among 3 people?

Answer in the book = 756756

2. The camera club has 5 members, and the mathematics club has 8. There is only one member common to both clubs. In how many ways could a committee of 4 people be formed with at least one member from each club?

Answer in the book = 459

3. There are 12 questions on an examination , and each student must answer 8 questions including at least 4 of the first 5 questions. How many different combinations of questions could a student choose to answer?

Answer in the book = 210

Please help me !!!