- #1
Heaviplace
- 4
- 0
Homework Statement
I have to test this series for convergency/divergency
Ʃ1000(3/4)^n - n/(n+10000)
n=1 to ∞
The Attempt at a Solution
At first I thought of analyzing both parts separately, (3/4)^n is a geometric series with r < 1 and so it converges, and applying the root test to n/(n+10000). Then I'd have the sum of two convergent series that ofc, also converges.
Went to test my hypothesis on WolframAlpha, and it actually told me the series diverges by the limit test, which I verified to be true.
So my question is, why was the method I used, wrong?
Thanks in advance!