Probability basics
Probability is counting, dressed up. Almost every question comes down to listing the equally likely outcomes and seeing how many of them count as a win, so this course builds from counting to expected value.
What you'll learn
11 chapters, then the quiz
- 01What probability meansA number between zero and one.
- 02Counting outcomesFavourable over total.
- 03Independent eventsMultiply along the and.
- 04Dependent eventsWhen the pool changes.
- 05Complements and at least oneWork from the opposite side.
- 06Adding probabilitiesOr, and the overlap you must subtract.
- 07Permutations and combinationsCounting when order does or does not matter.
- 08Conditional probabilityThe chance of one thing given another.
- 09Expected valueThe long run average of a gamble.
- 10Distributions in outlineThe shapes that keep appearing.
- 11Fallacies and trapsWhere intuition goes wrong.
More math & logic tests
See all →- Easy
Mental math sprint
Arithmetic you should be able to do without reaching for a calculator.
8 questions5 min - Hard
Logic puzzles
Short problems where the obvious answer is usually the wrong one.
7 questions9 min - Medium
Algebra fundamentals
Rearranging, solving and reading what an equation is telling you.
8 questions7 min