When Milo went to register for classes at the last minute,

Last updated: 7/10/2022

When Milo went to register for classes at the last minute, the only classes left to take were eight math courses, five computer science courses, four statistics courses, and six science courses. He shut his eyes and picked one at random. Find the probability that Milo selected either a science course or a math course. Express your answer as a reduced fraction.