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)
Anshum Sharma Best Answer
Here is the detailed solution we are using dot product properties where i.i = j.j = z.z = 1 and i.j = j.k = k.i = 0