Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Chandra prakash
As you know that , integration of del(x-n) is equal to one, ,,, now look at the optiones,,,,,, Cosπ =-1,,, so the whole series becomes 1+ zero becos all the cos terms cancell outs each other so thats how we get it,,,, i hope u understood it