Lucknow

Hi Shubha,
All the three institutes mentioned by you are equally good and thus it will be very difficult to tell which one will be the best option.
However, we can help you with the parameters that you can keep in mind while choosing an institute among the three.
You can consider the below parameters
1) Faculty,
2) Affiliation / Recognition
3) Course Material,
4) Quality Education,
5) Fees
6) Infrastructure
7) Success Rate.
8) Placement
9) Top recruiting companies.
Also, if possible go through the alumni speak section to get an idea what the alumni thinks about the institute.
Hope this information helps. Please feel free to revert.
Wish you luck.

Hi Aanchal,
Career Prospects:-
A two-year programme, an M.Sc programme can either be academic in nature for those who want to pursue teaching or research as a career, or may be application-based, for those who want to join an industry after completing the course.
While an academic M.Sc programme can lead to further studies or a doctoral-level science programme in related field worldwide, an applied science M.Sc programme is usually considered a terminal degree abroad.
Refer to the below link to know about more institutes offering Master of Science (MSc) in Mathematics:
http://goo.gl/14qnQp
I hope it helps. Please feel free to revert.
Wish you luck.