The probability that a student who plays a sport does not play an instrument is 13 / 30.
Probability determines the chances that an event would happen. The probability the event occurs is 1 and the probability that the event does not occur is 0.
The probability that a student who plays a sport does not play an instrument = 13 / total number of students
13 / (12 + 13 + 2 + 3) = 13 / 30
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