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) 
		 
			 
			 
			 
			 
			 
			 
			 
			 
			 
 30 points
 30 points 
 
 
 
             
            

 
                
Abhijeet Gaurav![best-answer]() 
			
Answer is (C). It would be 20^2. As First amino acid can take 20 type & in 2nd you can choose by 20 ways. So its 20^2.