How can I tell if a infinite series converges or diverges?

Question

jennyrlz · Answer

one sec let me look through my notes, i ahve it somewhere xD

jennyrlz · Answer

Ok if a series is increasing whether it be multiplying or adding it is diverging, if it is decreasing whether that me dividing or subtracting it is converging :)

bloomlocke367 · Answer

oh, okay

bloomlocke367 · Answer

how can I tell with an equation?

jennyrlz · Answer

hmm how about this let me find you a website i study on :)

jennyrlz · Answer

http://tutorial.math.lamar.edu/Classes/CalcII/ConvergenceOfSeries.aspx

jennyrlz · Answer

its been a while since ive worked on converging or diverging so sorry i cant be of more help :)

anonymous · Answer

There are a couple of tests But take a look at this link.. scroll down a a bit and it clearly states all the diff tests http://math2.org/math/expansion/tests.htm

bloomlocke367 · Answer

like, I have$$\Large\sum_{n-1}^{\infty}-4(-\frac{1}{2})^{n-1}$$

bloomlocke367 · Answer

how can i tell?

anonymous · Answer

n=1 or k=n-1?

bloomlocke367 · Answer

what?

anonymous · Answer

like my question basically is ...
when does the series start? 
At 1 or n-1?

anonymous · Answer

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