Answer: There is a 75% chance of passing at least one class.
To solve this problem, you should set up a Venn diagram with 2 circles. The left will be history and the right will be math. In the intersection, you will have 43%. That leaves 15% for history only and 17% for math only.
Since we are looking for the probability of at least one class, we should add up all 3 individual sections of the diagrams.
15% + 43% + 17% = 75%
