Combinatorics - combinatorial rules of product and sum, permutation, combination (with repeating, without repeating), binomial theorem, combinatorial identities, inclusion-exclusion principle, pigeonhole principle.
Probability - random event, combinatorial probability, random variable and its distribution of probability, conditional probability, independence of random events and variables, distribution function, moments
Basic concepts of combinatorics, permutation, combination, combinatorial probability, random events, random variables, independence, conditional probability, distribution of probability