Difference between revisions of "1964 AHSME Problems/Problem 34"
(Created page with "==Problem== If <math>n</math> is a multiple of <math>4</math>, the sum <math>s=1+2i+3i^2+\cdots+(n+1)i^n</math>, where <math>i=\sqrt{-1}</math>, equals: <math>\textbf{(A) }1+i\...") |
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Revision as of 17:07, 5 March 2014
Problem
If 
is a multiple of 
, the sum 
, where 
, equals:
![$\textbf{(A) }1+i\qquad\textbf{(B) }\frac{1}{2}(n+2)\qquad\textbf{(C) }\frac{1}{2}(n+2-ni)\qquad\textbf{(D) }\frac{1}{2}[(n+1)(1-i)+2]\qquad \textbf{(E) }\frac{1}{8}(n^2+8-4ni)$](http://latex.artofproblemsolving.com/6/3/8/638574e4f903228333bc4eeca05825c9fc3249c4.png)
