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
Topic A: Lesson 4: Using permutations and combinations to compute probabilities
Getting exactly two heads (combinatorics)
Exactly three heads in five flips
Example: Different ways to pick officers
Example: Combinatorics and probability
Example: Lottery probability
Mega millions jackpot probability
Probability with permutations and combinations