In a group of 800 people, 3/5 play at least one instrument, 96 play two or more. What is the probability that one student play exactly one instrument?
Answers:	A) 2/125	B) 12/25	C) C)2/25	D) 3/25	E) 1/5
P(playing 2 or more instruments) = 96/800 = 3/25.   Then, the probability of playing exactly one instrument is given by:   P(playing 1 or more instruments) - P(playing 2 or more instruments) = 3/5 - 3/25 = 12/25.   Answer 12/25.
<result>B</result>
In a group of 800 people, 3/5 play at least one instrument, 96 play two or more. What is the probability that one student play exactly one instrument?