1 is 1. According to the survey in official website, north university of china, in 2022, the number of students enrolled in mathematics major is directly proportional to the number of students enrolled, so the enrollment ratio is 1 ratio 1. The recruitment ratio is, if the recruitment ratio is greater than 1, it means that the number of applicants is more than the number of applicants. Similarly, if the enrollment ratio is less than 1, it means that the number of applicants is less than the number of applicants.