Question

answer to this question

Answer 1

The answer is i
Since n€N,therefore we can answer this by taking n=1(taking other values is not required)
Now,taking n=1,we get:-
(i^(4+1)-i^(4-1))/2
=i^3(i^2-1)/2
=-i(-1-1)/2 (as i^2=-1)
=(-i×-2)/2
=i