Into a room you store 38 black bottles and 4 green bottles, and you turn off the light. If you ask to someone look for 2 bottles without turn on the light, what is the probability of both the selected bottles will be green? Choose the correct choice from the following choices.
A) 1 / 574 B) 2 / 574 C) 1 / 287 D) 2 / 287 E) 3 / 287

Rationale: there are 4 green bottles in a group of 38 + 4 that is 42 . thus the probability of picking 2 green bottles is : ( 4 / 42 ) ( 3 / 41 ) = 2 / 287 . the correct answer is d .
Answer: D