Ⅰ.
Number of cases
1.
Permutations and combinations
01 Various permutations
02 Overlapping combinations and binomial theorem

Ⅱ.
probability
1.
The meaning and use of probability
01 Meaning and Use of Probability
2.
Conditional probability
02 Conditional probability

Ⅲ.
statistics
1.
probability distribution
01 Discrete random variables and binomial distribution
02 Continuous random variables and normal distribution
2.
statistical estimation
01.
statistical estimation