The difficulty difference between the number 1 and the number 2 lies in the content of the examination scope. The major of number one requires higher mathematics, while the scope of number two is narrower, so the examination is deeper. The difference in difficulty between number one and number two lies in the different scope and content of the exam. The examination contents of number one include advanced mathematics, linear algebra and probability theory and mathematical statistics, number two includes advanced mathematics and linear algebra, and number 1 includes advanced mathematics, linear algebra and probability theory and mathematical statistics. These three parts are relatively deep and extensive fields in the field of mathematics, especially probability theory and mathematical statistics, which involve a large number of formulas, theorems and calculation skills, and require candidates to have strong logical thinking ability and calculation ability. The examination content of number 2 includes advanced mathematics and linear algebra. Although these two parts are also the basic contents of mathematics, compared with the number 1, probability theory and mathematical statistics are not involved, so they are within the scope of the examination.