I think institutions are good for students, but being a student of IIT Delhi, I can vouch for it. Opting for IIT Delhi maths and computer is a good option if you are interested in CS as compared to faking CS from IIT Hyderabad.
While most people consider MNC as a backup option for CS, you will be surprised to know that the curriculum has more mathematics than computer science courses.
Curriculum
Placements
It's the electives you take up that determine your job prospects. The placements are usually spectacular and that should be your last concern.
CGPA
So, I recommend you to go to this branch only if you are sincerely interested in core Mathematics.