In a group of 800 people, 1/5 play at least one instrument, 32 play two or more. What is the probability that one student play exactly one instrument?  Choose the correct choice from the following
A) 2 / 125  B) 4 / 25  C) 2 / 25  D) 3 / 25  E) 1 / 5

Rationale: "p ( playing 2 or more instruments ) = 32 / 800 = 1 / 25 . then , the probability of playing exactly one instrument is given by : p ( playing 1 or more instruments ) - p ( playing 2 or more instruments ) = 1 / 5 - 1 / 25 = 4 / 25 . answer b ."
Answer: B