Every time you check a weather forecast, evaluate an investment, or decide whether to bring an umbrella—you're already doing probability. Most people just don't recognize it as such.
This series builds probability from the ground up: how events combine (addition rule), how they chain together (multiplication rule), and eventually conditional probability and Bayes' theorem. Not as abstract formulas, but as tools for thinking clearly when you don't know what's going to happen.
What You'll Be Able to Do
By the end, you should be able to look at a probability problem and instinctively know which tools to reach for—and understand why those tools work, not just how to apply them mechanically.
The examples use dice, cards, and coins because they're the cleanest way to illustrate the concepts. Once the intuition clicks, you'll start seeing probability everywhere.
Prerequisites
Nothing beyond basic arithmetic. Comfortable with fractions and percentages? You're ready.
Start with the Addition Rule.