1 and the number three 880 are the examination subject codes for the third postgraduate entrance examination, and the number one 880 is the examination subject code for the first postgraduate entrance examination.

Counting one 880 is usually more difficult than counting three 880. Because there are many exam contents in Math One, the questions are relatively difficult.

3. The number one 880 is a math subject suitable for engineering majors, and the number three 880 is a math subject suitable for economics and management majors.