Question 8.68

37. Suppose you have 10 books in a stack but you only have space for five books on your bookshelf.

  1. In how many different ways can you select five books from the stack and arrange them in the empty space on your bookshelf?
  2. How many different selections of five books can you make? (Don’t worry about how you will arrange the books.)

37.

(a)

(b)