A class contains 100 students, and each student belongs to one lab section. There are 3 lab sections, with 32 students in lab 1, 33 students in lab 2, and 35 students in lab 3. In a recent test, 5 students in lab 1 got an A+, 2 students in lab 2 got an A+. and 3 students in lab 3 got an A+. If i first choose a lab at random, and then choose a student randomly within that lab, what is the chance that they got an A+? (Hint: What are the different ways this can happen? Add up each of their chances.)