Learning Roadmap
Follow the path to build unbreakable foundations.
Chapter 1: The Principle of Counting
Master the real foundation of combinations. If this becomes automatic, permutations and combinations become almost trivial.
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Chapter 2: Factorial Intuition
Forget the symbol first. Understand shrinking choices during arrangement.
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Chapter 3: Permutations (Coming Soon)
When order matters and items are limited.