In a box of 10 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) 6/11
B) 7/15
C) 8/17
D) 9/22
E) 10/23
P(neither pen is defective) = 7/10*6/9 = 7/15   The answer is 7/15.
<result>B</result>
In a box of 10 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?