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? Choices.
A) 4 / 9	B) 5 / 11	C) 7 / 15	D) 9 / 22	E) 12 / 35

Rationale: "# defective pens = 3 # good pens = 7 probability of the 1 st pen being good = 7 / 10 probability of the 2 nd pen being good = 6 / 9 total probability = 7 / 10 * 6 / 9 = 7 / 15 the answer is c ."
Answer: C