In a box of 9 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) 4/7	B) 5/9	C) 6/11	D) 7/12	E) 8/15
# defective pens = 2   # good pens = 7   Probability of the 1st pen being good = 7/9   Probability of the 2nd pen being good = 6/8   Total probability = 7/9 * 6/8 = 7/12   The answer is 7/12.
<result>D</result>
In a box of 9 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?