You have five books that you want to donate, and there are 20 poor students. In how many ways you can distribute the books? a. The books are different and you want to give only one book per student....

You have five books that you want to donate, and there are 20 poor
students. In how many ways you can distribute the books?
a. The books are different and you want to give only one book per student.
b. The books are identical and you want to give only one book per student.
c. The books are different and you may give more than one book per student.
d. The books are identical and you may give more than one book per student.