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?	Pick.
A) 2 / 7
B) 3 / 7
C) 3 / 14
D) 5 / 28
E) 9 / 28

Rationale: the number of ways of choosing 2 books from the shelf is 8 c 2 = 28 . the number of ways of choosing 2 red books is 4 c 2 = 6 . p ( 2 red books ) = 6 / 28 = 3 / 14 . the answer is c .
Answer: C