question_answer

If \[1=\sqrt{-1},\] then \[1+{{i}^{2}}+{{i}^{3}}-{{i}^{6}}+{{i}^{8}}\] is equal to      

A)  \[2+i\]                         

B)  \[2i\]

C)  \[3+i\]                         

D)  \[-\,1\]                                     

E)  None of these