Liberal arts students in Henan province do not take binomial in mathematics in college entrance examination. Binomial theorem is a part of the elective course 2-3 of senior high school mathematics in People's Education Press. We mainly master the binomial expansion theorem, know the solution of the general term formula of binomial expansion, and know the quadratic coefficient and coefficient of each term (binomial coefficient and term coefficient are different, so we must pay attention). Solving this problem requires a number of combinations, so all the permutations and combinations in this part are arranged together to form a module. But liberal arts don't learn permutation and combination, so naturally they don't learn binomial theorem.