Dear Ravina,
Indian Institute of Technology Delhi is among the top most engineering and technological colleges in the country. It offers M.Sc in Mathematics for a duration of 2 years at the postgraduate level. The total seat intake for the course is 68 and the Indian Institute of Technology Delhi fees for M.Sc in Mathematics is Rs 49,400. Selection to the course is based on the scores of the IIT JAM exam. For your other preference which is M.Sc in Computing, the institute offers a similar course named M.Sc Research in Computer Science and Engineering.
Hope this information helps!