Hii,
Last year cutoffs of iit delhi for btech in computer science and mathematics and computing are as follows:
General:104 and 329
OBC: 67 and 232
SC: 35 and 150
ST: 25 and 109

However cutoffs vary every year.
Good luck...

the last year cut off in terms of rank for iit delhi computer science was 

in general categoery it was opened at rank 3 and closed at rank 104.

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