The least positive integer n which will reduce i−1i+1nto a real number , is
2
3
4
5
(i−1i+1×i−1i−1)n=(−2i−2)n=in
Hence, to make the real number the least positive integar is 2.
The least positive integer n which will reduce (i−1i+1)nto a real number , is
The least positive integer n such that (2i1+i)n is a positive integer, is