Dear student,

There are around 110 seats in IIT Bombay for Computer Science Engineering . If you want to get admission in IIT Bombay, then first of all you have to give JEE Advance exam. And your rank in this exam must be very good. Only then you can get CS branch here. Below I am providing a link. Here you can check the seat matrix for all the branches in IIT Bombay.

https://www.google.com/amp/s/engineering.careers360.com/articles/iit-bombay-seat-matrix/amp

Hope it helps.