A secondary school is offering two extracurricular classes, one in Photography and the other in Swimming. These classes are open to all of the 250 students in the school. Suppose there are 48 students...

A secondary school is offering two extracurricular classes, one in Photography and the
other in Swimming. These classes are open to all of the 250 students in the school.
Suppose there are 48 students in the Photography class, 34 in the Swimming class, and
12 who are in both classes. If a student is randomly chosen, what is the probability that
this student is not enrolled in any one of these classes?