Hello STudent

BA Honours in economics deals with social science which includes production, distribution and its services to the common people. Mathematics is a stream of science and it is called queen of science.science deals with the knowledge of structured knowledge and organised knowledge of natural phenomena. For economics there's a lot of maths to do. Sometimes it's a tough subject also. Outstanding result in Ba Honours economics get only the right job prospect. Good result of mathematics graduate can lead him to a good and desirable job prospect for him. So most of the science graduate take maths honours  in India as goal of study.

Hope this helps.