Probability & Statistics · Probability
Counting & Combinatorics
How to count without listing: the multiplication principle, factorials, permutations (order matters) and combinations (order doesn't). The foundation of probability, from poker hands to portfolio choices.
Step 1 of 6 · Overview35 min read ·
Key idea
Prereqs: Exponents; Variables & equations. Next: Probability rules. Follows MIT 6.042 Mathematics for Computer Science (counting) and Khan Academy 'Counting, permutations and combinations'.Next: 1. The multiplication principle