In a class of students 14 students only play an instrument, 10 students only play a sport, and 26 student play a sport and an instrument. Given that a randomly selected student plays a sport, what is the probability (in reduced form) that the student also plays an instrument? a 13/18
b 13/7
c 13/20
d 13/5
Can someone tell me what it is and explain it, and NOT give a link or download to a website please.