Among 500 freshmen pursuing a business degree at a university, 305 are enrolled in an economics course, 216 are enrolled in a mathematics course, and...

Among 500 freshmen pursuing a business degree at a university, 305 are enrolled in an economics course, 216 are enrolled in a mathematics course, and 154 are enrolled in both an economics and a mathematics course. What is the probability that a freshman selected at random from this group is enrolled in an economics and or mathematics course