In a group of 40 students , 23 take the AP Psycholgy class , 18 take the AP Calculas
class, and 8 take both classes . What is the probability that a student takes AP
Psychology or AP Calculus ?

Explanation

To solve the problem step by step, we will use the principle of probability for the union of two events.

### Step 1: Define the Events
Let:
- Event A = the event that a student takes AP Psychology.
- Event B = the event that a student takes AP Calculus.

### Step 2: Identify the Given Values
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