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? Choose the correct choice from the following answers
A) 2/9  B) 3/10  C) 4/11  D) 5/12  E) 6/13
# defective pens = 3   # good pens = 6   Probability of the 1st pen being good = 6/9   Probability of the 2nd pen being good = 5/8   Total probability = 6/9 * 5/8 = 5/12   The answer is 5/12.
<result>D</result>
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?