In a box of 9 pens, a total of 3 are defective. If a customer buys 2 pens selected at random from the box, what is the probability that neither pen will be defective?  Pick:  A) 3 / 10  B) 4 / 11  C) 5 / 12  D) 6 / 13  E) 7 / 15

Rationale: p ( neither pen is defective ) = 6 / 9 * 5 / 8 = 5 / 12 the answer is c .
Answer: C