There are 8 books in a shelf that consist of 1 paperback books and 7 hardback books.
There are 8 books in a shelf that consist of 1 paperback books and 7 hardback books. If 3 books are selected at random without replacement, how many different combinations are there that at least one paperback book is selected?
Answer/Solution
21
Steps/Work
8C3 [Select any four] - 7C3 [Select all hard backs] = 21
A
A