In a box of 10 pens, a total of 2 are defective. If a customer buys 2 pens selected at random from the box, what is the probability that neither pen will be defective?	Options: A) 7/12 B) 11/20 C) 17/30 D) 28/45 E) 51/90
# defective pens = 2   # good pens = 8   Probability of the 1st pen being good = 8/10   Probability of the 2nd pen being good = 7/9   Total probability = 8/10 * 7/9 = 28/45   The answer is 28/45.
<result>D</result>
In a box of 10 pens, a total of 2 are defective. If a customer buys 2 pens selected at random from the box, what is the probability that neither pen will be defective?