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)
Abhishek singh Best Answer
option C is correct answer. Remember this as a formula. but if it was asked for air bubble inside any liquid then the anwer would bhi half of option C