SOLUTION: What is the sum Σ from n=1 to infinity for the expression (-1)^n+1 (1/3n). The correct answer is one of the following. Which one? A) 13/180 B) 7/36 C) -13/180 D) 2

Algebra ->  Sequences-and-series -> SOLUTION: What is the sum Σ from n=1 to infinity for the expression (-1)^n+1 (1/3n). The correct answer is one of the following. Which one? A) 13/180 B) 7/36 C) -13/180 D) 2      Log On


   

Question 1198601: What is the sum Σ from n=1 to infinity for the expression (-1)^n+1 (1/3n).
The correct answer is one of the following. Which one?
A) 13/180
B) 7/36
C) -13/180
D) 25/36
E) -7/36
Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


Not clear. Use parentheses.

The expression as you show it:

(-1)^n+1 (1/3n) --> %28-1%29%5En%2B1+%281%2F3n%29

Other possibilities for what the expression is really supposed to be....

(-1)^(n+1) (1/3n) --> %28-1%29%5E%28n%2B1%29+%281%2F3n%29

(-1)^(n+1) ((1/3)n) --> %28-1%29%5E%28n%2B1%29+%28%281%2F3%29n%29

All of those possibilities either do not converge or converge but not to any of the given answer choices.

Re-post, showing the problem clearly.