There are 4 red books and 4 blue books on a shelf. If 2 books are selected at random from the shelf, what is the probability that both books selected are red books?	Choose the correct choice from the following answers.
A) 2/7  B) 3/7  C) 3/14  D) 5/28  E) 9/28
The number of ways of choosing 2 books from the shelf is 8C2 = 28.   The number of ways of choosing 2 red books is 4C2 = 6.   P(2 red books) = 6/28=3/14.   The answer is 3/14.
<result>C</result>
There are 4 red books and 4 blue books on a shelf. If 2 books are selected at random from the shelf, what is the probability that both books selected are red books?