First select 2 student from 4 students that would be 4C2 = 6 pairs
this distribution is Distinct to Distinct , we can see as function from object {A} to students {B}
Total no of function from A-->B = |B||A|
=2^6
total no. of student pairs are 6, every pair has 2^6 ways
hence , total no of distribution = 6*2^6