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)
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Bajrang
plz follow the data communications and networking 5th edition by forouzan page 80 here explain SNR and page 83 example 3.37 , example 3.40 in your question only formulas r applied . i m also attach this pages so plz read. agar phir bhi doubt reh jaye to reply krna