Khan Academy (English - US curriculum)
Math by grade
Eureka Math/EngageNY
Precalculus (Eureka Math/EngageNY)
Module 5: Probability and statistics
Topic A: Lesson 4: Using permutations and combinations to compute probabilities
Example: Combinatorics and probability
Example: Combinatorics and probability
Probability of getting a set of cards
License: CC BY-NC-SA by Khan Academy